question
stringlengths
15
862
choices
sequence
answer
int8
0
3
hint
stringlengths
0
815
task
stringclasses
3 values
grade
stringclasses
12 values
subject
stringclasses
3 values
topic
stringclasses
25 values
category
stringlengths
5
35
skill
stringlengths
8
100
lecture
stringlengths
0
3.08k
solution
stringlengths
0
1.36k
Complete the sentence. An iceberg melting slowly is a ().
[ "physical change", "chemical change" ]
0
closed choice
grade3
natural science
chemistry
Physical and chemical change
Identify physical and chemical changes
Chemical changes and physical changes are two common ways matter can change. In a chemical change, the type of matter changes. The types of matter before and after a chemical change are always different. Burning a piece of paper is a chemical change. When paper gets hot enough, it reacts with oxygen in the air and burns. The paper and oxygen change into ash and smoke. In a physical change, the type of matter stays the same. The types of matter before and after a physical change are always the same. Cutting a piece of paper is a physical change. The cut pieces are still made of paper. A change of state is a type of physical change. For example, ice melting is a physical change. Ice and liquid water are made of the same type of matter: water.
An iceberg melting is a change of state. So, it is a physical change. An iceberg is made of frozen water. As it melts, the water changes from a solid to a liquid. But a different type of matter is not formed.
Is a sandwich a good or a service?
[ "a good", "a service" ]
0
closed choice
grade2
social science
economics
Economics
Goods and services
Everything you can buy is either a good or a service. A good is something you can touch or hold in your hands. For example, a hammer is a good. A service is a job you pay someone else to do. For example, cooking food in a restaurant is a service.
To decide whether a sandwich is a good or a service, ask these questions: Is a sandwich something you can touch? Yes. Is a sandwich a job you might pay someone else to do? No. So, a sandwich is a good.
What does this Works Cited entry indicate about the cited work? Davis, Lydia. Samuel Johnson is Indignant: Stories. Brooklyn: McSweeney's Books, 2001. Print.
[ "It is an article.", "It is a short story.", "It is a book." ]
2
closed choice
grade11
language science
reference-skills
Research skills
Understand a Works Cited entry (MLA 7th edition)
When writing research papers, you will often be asked to follow a particular style guide for your citations. One popular style guide is the Modern Language Association (MLA) Handbook. Below are the basic formats for some common types of Works Cited entries. Consult the MLA Handbook for a complete list. Books: Format | Author(s). Book Title. City of Publication: Publisher, Year of Publication. Medium of Publication. Example | Austen, Jane. Pride and Prejudice. New York: Dover Publications, 1995. Print. Essays, short stories, or poems in an anthology or book: Format | Author(s). "Essay, Poem, or Short Story Title." Anthology or Book Title. Ed. Editor Name. City of Publication: Publisher, Year of Publication. Page Number(s). Medium of Publication. Example | James, Henry. "The Middle Years." The Oxford Book of American Short Stories. Ed. Joyce Carol Oates. Oxford: Oxford UP, 2013. 116-135. Print. Magazine and newspaper articles: Format | Author(s). "Article Title." Title of Magazine or Newspaper Date of Publication: Page(s). Medium of Publication. Example | Hayes, David J., and James H. Stock. "The Real Cost of Coal." New York Times 24 Mar. 2015: n. pag. Web. 25 Mar. 2015. Journal articles: Format | Author(s). "Article Title." Title of Journal Volume.Issue (Year): Page(s). Medium of Publication. Example | Gillette, Jane, et al. "Human Simulations of Vocabulary Learning." Cognition 73.2 (1999): 135-176. Print. Web pages: Format | Author(s). "Page Title." Name of Website. Publisher, Date of Publication. Medium of Publication. Date of Access. Example | Gunn, Janelle P., and Lauren E. Owens. "How to Slash Sodium from Your Diet." Livestrong.com. Demand Media, 30 Mar. 2015. Web. 31 Mar. 2015. Additional guidelines: Author Names. The first author's name is written in last name, first name format (Smith, Jane). Additional author names are written in first name last name format (Smith, Jane, and John Doe). If there are more than three authors, the first author's name is followed by "et al.," which stands for and others (e.g., Smith, Jane, et al.). Medium of Publication. Each entry must include information about what form the content was communicated in. The most common mediums are "Print" and "Web," but other possibilities include "Film," "E-mail," and "Lecture." Whenever the Medium of Publication is "Web," the date of access (the day, month, and year the webpage was viewed) must be listed directly after the Medium of Publication. Editors and Translators. If a work has an editor or a translator, this information must be added to the Works Cited entry using the appropriate abbreviation. "Ed." stands for edited by. "Trans." stands for translated by. Missing Information. If a work has no known author, the author section of the citation is simply left out. If a work has no available page numbers, the abbreviation "n. pag." is used instead. If a work has no available publication date, the abbreviation "n.d." is used instead. If a work has no available publisher or no available city of publication, the abbreviation "n.p." is used instead.
Look closely at the Works Cited entry: Davis, Lydia. Samuel Johnson is Indignant: Stories. Brooklyn: McSweeney's Books, 2001. Print. You can tell that the cited work is a book because of the entry's formatting. Book entries always include the book title in italics followed by the place of publication, the publisher name, and the year of publication.
Select the part whose main job is to sort and package proteins and other substances in an animal cell.
[ "chromosomes", "Golgi", "nucleus", "vacuoles" ]
1
closed choice
grade8
natural science
biology
Cells
Identify functions of animal cell parts
Animal cells are made up of many different parts. Each cell part has a function that helps the cell survive and grow. Some cell parts are called organelles. Organelles are cell structures that are surrounded by their own membranes. Here are some of the organelles in animal cells: Mitochondria help the cell get the energy it needs. Mitochondria break down sugar and release energy that the cell can use for all of its activities. The nucleus directs cell activities by sending instructions to different parts of the cell. The nucleus contains structures called chromosomes. The chromosomes are made mostly of hereditary material called DNA. DNA contains information that the cell uses for growth and activities. These instructions tell ribosomes how to build molecules called proteins, which make up cell structures and help chemical reactions happen in the cell. The endoplasmic reticulum is an organelle that helps ribosomes build proteins. The nucleus sends instructions for making proteins to ribosomes. Ribosomes can attach to the endoplamic reticulum. The endoplasmic reticulum and ribosomes use these instructions to make proteins that the cell needs to survive and grow. After proteins are made in the endoplasmic reticulum, they can be transferred to the Golgi. The Golgi is an organelle made up of flat, stacked membranes. The Golgi sorts and packages proteins and other substances. Then, the Golgi sends these substances to different parts of the cell. Some of these substances are sent to the cell membrane and released from the cell. Animal cells also have organelles for storage and waste removal. The vacuoles store sugar and other nutrients. The lysosomes break down worn-out cell parts and other waste. Animal cells usually have several vacuoles and lysosomes. Other cell parts are not surrounded by their own membranes. These cell parts are not organelles. The cell membrane is a thin layer that surrounds and protects the cell. This layer is a membrane, but it does not have a membrane surrounding it, so it is not an organelle. The cell membrane controls which substances enter and leave the cell. The cytoplasm is a thick liquid that fills the space inside the cell. The cytoplasm also helps the cell keep its shape and supports the other cell parts.
The Golgi sorts and packages proteins and other substances for the cell. The Golgi sends some of these substances to parts of the cell where they are needed. It sends other substances to the cell membrane, where they are released from the cell.
Which sentence states a fact?
[ "The United States Civil War began in 1861.", "The United States Civil War was the saddest war." ]
0
closed choice
grade5
social science
civics
Social studies skills
Identify facts and opinions
A fact is something that can be proved to be true. Facts can be proved by observing, measuring, or studying information. The flag of the United States has 13 stripes. This is a fact. It can be proved by looking at the flag and counting the number of stripes. An opinion is something that a person believes, thinks, or feels. An opinion cannot be proved true. The flag of the United States is easy to draw. This is an opinion. People may have different opinions about what makes a flag "easy" to draw.
The first sentence states a fact. The United States Civil War began in 1861. It can be proved by looking up the year that the United States Civil War started. The second sentence states an opinion. The United States Civil War was the saddest war. Saddest shows what a person believes, thinks, or feels. Another person might have a different opinion about what makes a war sad.
Which is a complete sentence?
[ "Abby spilled apple juice on the carpet.", "The cardboard box gets wet, it falls apart." ]
0
closed choice
grade3
language science
writing-strategies
Sentences, fragments, and run-ons
Is it a complete sentence or a run-on?
A sentence is a group of words that forms a complete thought. It has both a subject and a verb. My friends walk along the path. A run-on sentence is made up of two sentences that are joined without end punctuation or with just a comma. I knocked on the door it opened. It started raining, we ran inside. To fix a run-on sentence, separate it into two sentences. Add end punctuation after the first sentence, and capitalize the second sentence. I knocked on the door. It opened. It started raining. We ran inside. You can also fix a run-on sentence by rewriting it as a compound sentence. A compound sentence is two sentences joined by a comma and a conjunction such as and, but, or, or so. I knocked on the door, and it opened. It started raining, so we ran inside.
Abby spilled apple juice on the carpet is a complete sentence. The subject is Abby, and the verb is spilled.
Which phrase has a more negative connotation?
[ "slam the door", "shut the door" ]
0
closed choice
grade4
language science
vocabulary
Shades of meaning
Positive and negative connotation
Connotation is the feeling or idea that goes along with a word or phrase. Some words are close in meaning but have different connotations. For example, think about the words eager and impatient. They both mean wanting something to happen, but they have different connotations. Eager has a positive connotation. It is a nice word. An eager person is happy and excited. Impatient has a negative connotation. It is not a nice word. An impatient person is often pushy and demanding.
Slam the door has a more negative connotation. If you slam the door, you shut it in a loud and angry way.
What information supports the conclusion that Patty acquired this trait?
[ "Patty likes to visit sunflower fields.", "Last summer, Patty's neighbor showed her how to grow sunflowers.", "Both Patty and her father grow sunflowers." ]
1
Read the description of a trait. Patty knows how to grow sunflowers.
closed choice
grade8
natural science
biology
Genes to traits
Inherited and acquired traits: use evidence to support a statement
Organisms, including people, have both inherited and acquired traits. Inherited and acquired traits are gained in different ways. Inherited traits are passed down from biological parents to their offspring through genes. Genes are pieces of hereditary material that contain the instructions that affect inherited traits. Offspring receive their genes, and therefore gain their inherited traits, from their biological parents. Inherited traits do not need to be learned. Acquired traits are gained during a person's life. Some acquired traits, such as riding a bicycle, are gained by learning. Other acquired traits, such as scars, are caused by the environment. Parents do not pass acquired traits down to their offspring.
Which egg has a lower temperature?
[ "the egg with less thermal energy", "the egg with more thermal energy" ]
0
Two eggs are identical except for their thermal energies.
closed choice
grade5
natural science
physics
Heat and thermal energy
How are temperature and mass related to thermal energy?
Matter is made of tiny particles called atoms. Atoms are always moving. The energy of moving atoms is called thermal energy. The total amount of thermal energy in matter depends on three things: the type of matter, the amount of matter, and how fast the atoms are moving. Temperature measures how hot or cold matter is. If the atoms in matter slow down, the temperature goes down. The matter now has both less thermal energy and a lower temperature. What happens if the amount of matter changes? A 2-kilogram brick at 70°F has twice as much thermal energy as a 1-kilogram brick at 70°F. The two bricks have the same temperature, but the larger brick has twice as many atoms. So, it has twice as much thermal energy.
The two eggs are made of the same material and have the same mass. So, the egg with less thermal energy has a lower temperature.
Is the following trait inherited or acquired? Trevor has a scar on his left elbow.
[ "inherited", "acquired" ]
1
Hint: Most scars are caused by accidents during a person's life.
closed choice
grade3
natural science
biology
Heredity
Identify inherited and acquired traits
Organisms, including people, have both inherited and acquired traits. Inherited and acquired traits are gained in different ways. Inherited traits are passed down through families. Children gain these traits from their parents. Inherited traits do not need to be learned. Acquired traits are gained during a person's life. Some acquired traits, such as riding a bicycle, are gained by learning. Other acquired traits, such as scars, are caused by the environment. Children do not inherit their parents' acquired traits.
Children do not inherit their parent's scars. Instead, scars are caused by the environment. People can get scars after they get hurt. So, having a scar is an acquired trait.
Which correctly shows the title of a TV show?
[ "Legends of Chima", "legends of chima" ]
0
closed choice
grade3
language science
capitalization
Formatting
Capitalizing titles
In a title, capitalize the first word, the last word, and every important word in between. The Wind in the Willows James and the Giant Peach These words are not important in titles: Articles, a, an, the Short prepositions, such as at, by, for, in, of, on, to, up Coordinating conjunctions, such as and, but, or
Capitalize the first word, the last word, and every important word in between. The word of is not important, so it should not be capitalized. The correct title is Legends of Chima.
Which logical fallacy is used in the text? The thing that makes Hassan stand out as a remarkable cellist is that he's a marvelous musician who plays the cello splendidly.
[ "appeal to nature: the assumption that natural things are always good", "circular reasoning: an argument that supports a claim with the claim itself", "slippery slope fallacy: the false assumption that a small first step will lead to extreme consequences" ]
1
closed choice
grade10
language science
writing-strategies
Developing and supporting arguments
Classify logical fallacies
A strong argument uses valid reasoning and logic in support of a claim. When an argument or claim introduces irrelevant information or misrepresents the issues at hand, it may be committing a logical fallacy. Logical fallacies can hurt a writer's credibility and can lead readers to draw false conclusions. A logical fallacy may present irrelevant information: Fallacy | Description ad hominem | an attack against the person making the argument, rather than the argument itself appeal to nature | an argument that assumes the natural choice is always the best choice bandwagon fallacy | an argument that assumes the popular choice is always the best choice circular reasoning | an argument that supports a claim with the claim itself guilt by association | an unfair negative association with another person or group that is intended to discredit someone or something A logical fallacy may misrepresent the issues at hand: Fallacy | Description false causation | the assumption that because two things happened together, one caused the other false dichotomy | an argument that presents only two choices when more options exist hasty generalization | a broad claim based on too few observations slippery slope fallacy | the false assumption that a small first step will necessarily lead to extreme consequences straw man | a misrepresentation of an opponent's position that makes it easier to argue against
The text argues that Hassan is a remarkable cellist because he plays the cello well. However, the "evidence" is just a restatement of the claim itself. This illustrates a type of logical fallacy known as circular reasoning.
Which statement describes the boy's motion?
[ "The boy has a constant velocity.", "The boy is accelerating." ]
1
A boy is turning to the left as he rides a merry-go-round at a constant speed.
closed choice
grade8
natural science
physics
Velocity, acceleration, and forces
Identify whether objects are accelerating
An object's velocity describes its speed and its direction. An object has a constant velocity when neither its speed nor its direction is changing. So, an object has a constant velocity when the object is: moving in a straight line at a constant speed, or remaining motionless. If an object does not have a constant velocity, the object is accelerating. An object is accelerating when either its speed or its direction is changing. So, an object is accelerating when the object is: speeding up, slowing down, or changing direction.
The boy is changing direction. So, the boy is accelerating.
Is the following trait inherited or acquired? Lola has two arms and two legs.
[ "acquired", "inherited" ]
1
Hint: Lola was born with two arms and two legs.
closed choice
grade3
natural science
biology
Heredity
Identify inherited and acquired traits
Organisms, including people, have both inherited and acquired traits. Inherited and acquired traits are gained in different ways. Inherited traits are passed down through families. Children gain these traits from their parents. Inherited traits do not need to be learned. Acquired traits are gained during a person's life. Some acquired traits, such as riding a bicycle, are gained by learning. Other acquired traits, such as scars, are caused by the environment. Children do not inherit their parents' acquired traits.
Most humans are born with two arms and two legs. So, having two arms and two legs is an inherited trait.
Which sentence uses a simile?
[ "Ken's eyes are as green as emeralds.", "Ken's eyes are bright green emeralds." ]
0
closed choice
grade4
language science
figurative-language
Literary devices
Identify similes and metaphors
Similes and metaphors are figures of speech that compare two things that are not actually alike. A simile compares two things by saying that one is like the other. Similes often use the words like and as. My sister runs like a cheetah. The sister's running and a cheetah's running are compared using the word like. A cheetah is known for running fast, so the simile means that the sister also runs fast. The cat's fur was as dark as the night. The cat's fur and the night are compared using the word as. The night is dark, so the simile means that the cat's fur is also dark. A metaphor compares two things by saying that one of them is the other. Unlike similes, metaphors don't use the word like or as. The snow formed a blanket over the town. The snow and a blanket are compared without the word like or as. A blanket is a large piece of cloth that completely covers a bed. The metaphor makes the reader imagine that the snow becomes a blanket, covering the town completely. Using similes and metaphors in your writing can help you create an interesting picture for the reader.
This sentence uses a simile: Ken's eyes are as green as emeralds. The words eyes and emeralds are compared using the word as. This sentence uses a metaphor: Ken's eyes are bright green emeralds. The words eyes and emeralds are compared without the word like or as.
Compare the motion of two fish. Which fish was moving at a lower speed?
[ "a fish that moved 5kilometers in 10hours", "a fish that moved 30kilometers in 10hours" ]
0
closed choice
grade2
natural science
physics
Force and motion
Compare the speeds of moving objects
An object's speed tells you how fast the object is moving. Speed depends on both distance and time. Distance tells you how far the object has moved. One unit used to measure distance is the kilometer. Time tells you how long the object has spent moving. One unit used to measure time is the hour. Think about two objects moving for the same amount of time. The object that is moving slower will go a shorter distance in that time. It is moving at a lower speed.
Look at the distance each fish moved and the time it took to move that distance. One fish moved 5 kilometers in 10 hours. The other fish moved 30 kilometers in 10 hours. Notice that each fish spent the same amount of time moving. The fish that moved 5 kilometers moved a shorter distance in that time. So, that fish must have moved at a lower speed.
Which tense does the sentence use? In the darkness, Rose strained her eyes.
[ "past tense", "present tense", "future tense" ]
0
closed choice
grade4
language science
verbs
Verb tense
Is the sentence in the past, present, or future tense?
Present tense verbs tell you about something that is happening now. Most present-tense verbs are regular. They have no ending, or they end in -s or -es. Two verbs are irregular in the present tense, to be and to have. You must remember their forms. Past tense verbs tell you about something that has already happened. Most past-tense verbs are regular. They end in -ed. Some verbs are irregular in the past tense. You must remember their past-tense forms. Future tense verbs tell you about something that is going to happen. All future-tense verbs use the word will. Present | Past | Future walk, walks | walked | will walk go, goes | went | will go
The sentence is in past tense. You can tell because it uses a past-tense verb, strained. The verb ends in -ed and tells you about something that has already happened.
How long does it take to toast bread in the toaster?
[ "2 seconds", "2 minutes" ]
1
Select the better estimate.
closed choice
grade3
natural science
units-and-measurement
Units and measurement
Choose units of time
Measurements are written with both a number and a unit. The unit comes after the number. The unit shows what the number means. Imagine being told that the bus leaves in 7. You might be thinking, 7 what? Does the bus leave in 7 minutes? 7 seconds? The number 7 on its own does not give you much information about when the bus is leaving. That is because the units are missing. Time is usually measured in units of seconds, minutes, or hours. It takes about 1 second to sneeze and 1 minute to get dressed in the morning. It takes about 1 hour to bake a pie in the oven. There are 60 seconds in 1 minute. So, 1 second is much less than 1 minute. There are 60 minutes in 1 hour. So, 1 minute is much less than 1 hour.
The better estimate for how long it takes to toast bread in the toaster is 2 minutes. 2 seconds is too fast.
Which type of sentence is this? As Alvin sat down on the rickety old chair, it abruptly collapsed beneath him.
[ "complex", "simple", "compound", "compound-complex" ]
0
closed choice
grade9
language science
grammar
Phrases and clauses
Is the sentence simple, compound, complex, or compound-complex?
A clause is a group of words that contains both a subject and a predicate. An independent clause is a complete thought that can stand alone as a sentence. A dependent clause (or subordinate clause) is not a complete thought and cannot stand alone as a sentence. the oranges on our tree are ripe The clause can stand alone. It is independent. after we pick up Kevin from work The clause cannot stand alone. It is dependent. A simple sentence is made up of a single independent clause. Ben and I spent all day relaxing by the pool. Some simple sentences have introductory phrases, but the introductory phrase is part of the predicate. In the winter, Ben usually wears his heavy coat. Ben usually wears his heavy coat in the winter. A compound sentence is made up of two independent clauses joined by a coordinating conjunction such as and, but, or, or so. We saw the flash of lightning, and seconds later we heard a rumble of thunder. A complex sentence is made up of an independent clause and a dependent clause. The dependent clause in a complex sentence usually begins with a subordinating conjunction or relative pronoun. Subordinating conjunctions include after, although, as, because, before, if, since, unless, until, when, and while. Relative pronouns include that, which, who, whom, or whose. If she ever gets the chance, Terri would love to visit the Egyptian pyramids. During his trip to Italy, Tony visited the Trevi Fountain, which is in Rome. A compound-complex sentence is made up of two or more independent clauses and one or more dependent clauses. After Samantha left work, she stopped at the bank, and then she went to the gym. Sometimes a dependent clause in a complex or compound-complex sentence can interrupt an independent clause. Orcas that are kept in captivity often have bent dorsal fins.
The sentence is complex. It is made up of an independent clause and a dependent clause. The dependent clause begins with the subordinating conjunction as. As Alvin sat down on the rickety old chair, it abruptly collapsed beneath him.
Is the following trait inherited or acquired? Hansen has a scar on his right hand.
[ "inherited", "acquired" ]
1
closed choice
grade5
natural science
biology
Traits and heredity
Identify inherited and acquired traits
Organisms, including people, have both inherited and acquired traits. Inherited and acquired traits are gained in different ways. Inherited traits are passed down through families. Children gain these traits from their parents. Inherited traits do not need to be learned. Acquired traits are gained during a person's life. Some acquired traits, such as riding a bicycle, are gained by learning. Other acquired traits, such as scars, are caused by the environment. Children do not inherit their parents' acquired traits.
Children do not inherit their parent's scars. Instead, scars are caused by the environment. People can get scars after they get hurt. So, having a scar is an acquired trait.
What do these two changes have in common? milk going sour rust forming on a metal gate
[ "Both are only physical changes.", "Both are caused by heating.", "Both are chemical changes.", "Both are caused by cooling." ]
2
closed choice
grade3
natural science
chemistry
Physical and chemical change
Compare physical and chemical changes
Chemical changes and physical changes are two common ways matter can change. In a chemical change, the type of matter changes. The types of matter before and after a chemical change are always different. Some chemical changes are caused by heating or cooling. For example, burning a piece of paper is a chemical change caused by heating. When paper gets hot enough, it re­acts with oxygen in the air and burns. The paper and oxygen change into ash and smoke. In a physical change, the type of matter stays the same. The types of matter before and after a physical change are always the same. A change of state is a type of physical change. Changes of state can be caused by heating or cooling. For example, ice melting is a physical change that can be caused by heating. Ice and liquid water are made of the same type of matter: water. The law of conservation of mass says that all physical and chemical changes conserve mass. Conserve means to keep the same. So, the total mass before a physical or chemical change is equal to the total mass after the change.
Step 1: Think about each change. Milk going sour is a chemical change. The type of matter in the milk slowly changes. The new matter that is formed gives the milk its sour taste. Rust forming on a metal gate is a chemical change. As the gate rusts, the metal turns into a different type of matter called rust. Rust is reddish-brown and falls apart easily. Step 2: Look at each answer choice. Both are only physical changes. Both changes are chemical changes. They are not physical changes. Both are chemical changes. Both changes are chemical changes. The type of matter before and after each change is different. Both are caused by heating. Neither change is caused by heating. Both are caused by cooling. Neither change is caused by cooling.
Which correctly shows the title of a newspaper?
[ "News Sun and Evening Star", "News Sun and Evening star" ]
0
closed choice
grade4
language science
capitalization
Formatting
Capitalizing titles
In a title, capitalize the first word, the last word, and every important word in between. The Wind in the Willows James and the Giant Peach These words are not important in titles: Articles, a, an, the Short prepositions, such as at, by, for, in, of, on, to, up Coordinating conjunctions, such as and, but, or
Capitalize the first word, the last word, and every important word in between. The word and is not important, so it should not be capitalized. The correct title is News Sun and Evening Star.
What information supports the conclusion that Ethan inherited this trait?
[ "Ethan's biological mother often wears her naturally brown hair in a bun.", "Ethan and his siblings all have naturally straight hair.", "Ethan and his biological father have short hair." ]
0
Read the description of a trait. Ethan has naturally brown hair.
closed choice
grade7
natural science
biology
Genes to traits
Inherited and acquired traits: use evidence to support a statement
Organisms, including people, have both inherited and acquired traits. Inherited and acquired traits are gained in different ways. Inherited traits are passed down from biological parents to their offspring through genes. Genes are pieces of hereditary material that contain the instructions that affect inherited traits. Offspring receive their genes, and therefore gain their inherited traits, from their biological parents. Inherited traits do not need to be learned. Acquired traits are gained during a person's life. Some acquired traits, such as riding a bicycle, are gained by learning. Other acquired traits, such as scars, are caused by the environment. Parents do not pass acquired traits down to their offspring.
How long is a tennis racket?
[ "65 kilometers", "65 centimeters" ]
1
Select the better estimate.
closed choice
grade3
natural science
units-and-measurement
Units and measurement
Choose metric units of distance
Measurements are written with both a number and a unit. The unit comes after the number. The unit shows what the number means. Imagine being told that a pencil is 16 long. You might be thinking, 16 what? Is the pencil 16 centimeters long? 16 meters? 16 kilometers? The number 16 on its own does not give you much information about the length of the pencil. That is because the units are missing. Now look at the drawing of the pencil and the ruler. The ruler shows that the units are centimeters. So, the length of the pencil is 16 centimeters. There are 100 centimeters in 1 meter. So, 1 centimeter is much shorter than 1 meter. There are 1,000 meters in 1 kilometer. So, 1 meter is much shorter than 1 kilometer.
The better estimate for the length of a tennis racket is 65 centimeters. 65 kilometers is too long.
How long is a sofa?
[ "10 inches", "10 feet", "10 miles", "10 yards" ]
1
Select the best estimate.
closed choice
grade7
natural science
units-and-measurement
Units and measurement
Choose customary units of distance, mass, and volume
Measurements are written with both a number and a unit. The unit comes after the number. The unit shows what the number means. When you are using customary units, length may be written with units of inches, feet, yards, or miles. There are 12 inches in 1 foot, and 3 feet in 1 yard. There are 5,280 feet in 1 mile. A football is about 1 foot long. A football field is 100 yards long.
The best estimate for the length of a sofa is 10 feet. 10 inches is too short. 10 yards and 10 miles are too long.
Is there a surplus or a shortage of tennis rackets?
[ "shortage", "surplus" ]
0
Tennis rackets are on sale for $40. The sporting goods store has 50 rackets available for sale. At that price, 65 people want to buy one.
closed choice
grade5
social science
economics
Supply and demand
Identify shortage and surplus
There is a surplus if there is too much for sale at a given price. There is a shortage if there is not enough for sale at a given price. Surpluses and shortages usually happen when people who are selling goods or services charge too much or too little. When the price is too high, consumers will not want to buy much of the good or service. The quantity demanded will be less than the quantity supplied. So, there will be a surplus. When the price is too low, too many consumers will want to buy the good or service. The quantity demanded will be more than the quantity supplied. So, there will be a shortage.
At the current price, there are not enough tennis rackets for sale. There are 50 rackets for sale, but 65 people want to buy one. So, there is a shortage of tennis rackets.
How long does it take to mow the lawn?
[ "37 minutes", "37 hours" ]
0
Select the better estimate.
closed choice
grade2
natural science
units-and-measurement
Units and measurement
Choose units of time
Measurements are written with both a number and a unit. The unit comes after the number. The unit shows what the number means. Imagine being told that the bus leaves in 7. You might be thinking, 7 what? Does the bus leave in 7 minutes? 7 seconds? The number 7 on its own does not give you much information about when the bus is leaving. That is because the units are missing. Time is usually measured in units of seconds, minutes, or hours. It takes about 1 second to sneeze and 1 minute to get dressed in the morning. It takes about 1 hour to bake a pie in the oven. There are 60 seconds in 1 minute. So, 1 second is much less than 1 minute. There are 60 minutes in 1 hour. So, 1 minute is much less than 1 hour.
The better estimate for how long it takes to mow the lawn is 37 minutes. 37 hours is too slow.
What does the allusion in this text suggest? Al Gore had a long career in politics as a congressman and vice president, but he met his Waterloo in the 2000 presidential election, when he lost to George W. Bush.
[ "He suffered a crushing defeat.", "He had his finest moment." ]
0
closed choice
grade10
language science
figurative-language
Literary devices
Interpret figures of speech
Figures of speech are words or phrases that use language in a nonliteral or unusual way. They can make writing more expressive. An allusion is a brief reference to something or someone well known, often from history or literature. "I'd better get home before I turn into a pumpkin!" Lila remarked.
The text uses an allusion, a brief reference to someone or something well known. The allusion met his Waterloo suggests that he suffered a crushing defeat. It refers to the French emperor Napoleon, who suffered his final defeat at the Battle of Waterloo in 1815.
How long is a walk across Central Park in New York City?
[ "2 millimeters", "2 meters", "2 kilometers", "2 centimeters" ]
2
Select the best estimate.
closed choice
grade7
natural science
units-and-measurement
Units and measurement
Choose metric units of distance, mass, and volume
Measurements are written with both a number and a unit. The unit comes after the number. The unit shows what the number means. When you are using metric units, length can be written with units of millimeters, centimeters, meters, or kilometers. One meter contains 100 centimeters or 1,000 millimeters. So, 1 meter is larger than 1 centimeter, and 1 centimeter is larger than 1 millimeter. The tip of the pencil shown here is only 1 millimeter wide, but the pencil is about 16 centimeters long. A red fox is about 1 meter long. The Sydney Harbour Bridge in Australia is about 1,000 meters, or 1 kilometer, in length.
The best estimate for the length of a walk across Central Park in New York City is 2 kilometers. 2 millimeters, 2 centimeters, and 2 meters are all too short.
Which logical fallacy is used in the text? How could Candice have anything insightful to say about foreign affairs? She grew up on a farm.
[ "ad hominem: an attack against the person making the argument, rather than the argument itself", "slippery slope fallacy: the false assumption that a small first step will lead to extreme consequences", "straw man: a misrepresentation of an opponent's position that makes it easier to argue against" ]
0
closed choice
grade10
language science
writing-strategies
Developing and supporting arguments
Classify logical fallacies
A strong argument uses valid reasoning and logic in support of a claim. When an argument or claim introduces irrelevant information or misrepresents the issues at hand, it may be committing a logical fallacy. Logical fallacies can hurt a writer's credibility and can lead readers to draw false conclusions. A logical fallacy may present irrelevant information: Fallacy | Description ad hominem | an attack against the person making the argument, rather than the argument itself appeal to nature | an argument that assumes the natural choice is always the best choice bandwagon fallacy | an argument that assumes the popular choice is always the best choice circular reasoning | an argument that supports a claim with the claim itself guilt by association | an unfair negative association with another person or group that is intended to discredit someone or something A logical fallacy may misrepresent the issues at hand: Fallacy | Description false causation | the assumption that because two things happened together, one caused the other false dichotomy | an argument that presents only two choices when more options exist hasty generalization | a broad claim based on too few observations slippery slope fallacy | the false assumption that a small first step will necessarily lead to extreme consequences straw man | a misrepresentation of an opponent's position that makes it easier to argue against
The text argues that Candice cannot be insightful about foreign affairs because she grew up on a farm. This is a personal attack that isn't relevant to whether she knows about foreign affairs. This illustrates a type of logical fallacy known as ad hominem.
Which of the following contains a vague pronoun reference?
[ "Mrs. Kemp was overjoyed when she saw her granddaughter for the first time in two years.", "When Mrs. Kemp saw her granddaughter for the first time in two years, she was overjoyed." ]
1
closed choice
grade10
language science
writing-strategies
Pronouns
Identify vague pronoun references
When writing, make sure to avoid vague pronoun references. A vague pronoun reference occurs when a pronoun could refer to more than one possible antecedent. When Lisa and Kim finally landed, she breathed a sigh of relief. The pronoun she could refer to either Lisa or Kim, so the meaning of the sentence is unclear. Vague pronoun references can be corrected in one of two ways: 1. Replace the pronoun with its correct antecedent: When Lisa and Kim finally landed, Lisa breathed a sigh of relief. 2. Rewrite the sentence: Lisa breathed a sigh of relief when she and Kim finally landed. A vague pronoun reference also occurs when they, them, their, theirs, it, or its is used without its antecedent. They say that this nail polish dries in less than five minutes. The pronoun they is used without its antecedent, so the meaning of the sentence is unclear. This problem can be fixed by replacing the pronoun with its missing antecedent. The advertisements say that this nail polish dries in less than five minutes.
The second answer choice contains a vague pronoun reference. The pronoun she could refer to Mrs. Kemp or her granddaughter. When Mrs. Kemp saw her granddaughter for the first time in two years, she was overjoyed. The first answer choice shows a possible correction for the vague pronoun reference. The text has been rewritten so that the meaning is clear. Mrs. Kemp was overjoyed when she saw her granddaughter for the first time in two years.
What is the source of the allusion in the sentence below? Bryce dropped out of college to travel the world, but a year later, the prodigal son returned home and re-enrolled.
[ "the Bible", "Greek mythology" ]
0
closed choice
grade8
language science
figurative-language
Literary devices
Recall the source of an allusion
An allusion is a brief mention of something or someone well known, often from mythology, history, or literature. An allusion lets you reference ideas from an entire story in just a few words. "I'd better get home before I turn into a pumpkin!" Lila remarked. Here, Lila alludes to the fairy tale "Cinderella," in which Cinderella must leave the ball before the coach that brought her transforms into a pumpkin. The allusion shows that Lila must depart immediately.
The source of the allusion prodigal son is the Bible. In a Biblical parable, the prodigal son irresponsibly spends the inheritance given to him by his father. When he returns home, he expects to be shamed, but his father forgives him. The allusion prodigal son means a person who behaves recklessly but later makes a repentant return.
Which tense does the sentence use? Janelle baked banana bread with nuts.
[ "future tense", "past tense", "present tense" ]
1
closed choice
grade3
language science
verbs
Verb tense
Is the sentence in the past, present, or future tense?
Present tense verbs tell you about something that is happening now. Most present-tense verbs are regular. They have no ending, or they end in -s or -es. Two verbs are irregular in the present tense, to be and to have. You must remember their forms. Past tense verbs tell you about something that has already happened. Most past-tense verbs are regular. They end in -ed. Some verbs are irregular in the past tense. You must remember their past-tense forms. Future tense verbs tell you about something that is going to happen. All future-tense verbs use the word will. Present | Past | Future walk, walks | walked | will walk go, goes | went | will go
The sentence is in past tense. You can tell because it uses a past-tense verb, baked. The verb ends in -ed and tells you about something that has already happened.
Which of the following contains a vague pronoun reference?
[ "Sarah asked Erica to make a flourless chocolate cake for their book club meeting because she has a gluten allergy.", "Because Erica has a gluten allergy, Sarah asked her to make a flourless chocolate cake for their book club meeting." ]
0
closed choice
grade10
language science
writing-strategies
Pronouns
Identify vague pronoun references
When writing, make sure to avoid vague pronoun references. A vague pronoun reference occurs when a pronoun could refer to more than one possible antecedent. When Lisa and Kim finally landed, she breathed a sigh of relief. The pronoun she could refer to either Lisa or Kim, so the meaning of the sentence is unclear. Vague pronoun references can be corrected in one of two ways: 1. Replace the pronoun with its correct antecedent: When Lisa and Kim finally landed, Lisa breathed a sigh of relief. 2. Rewrite the sentence: Lisa breathed a sigh of relief when she and Kim finally landed. A vague pronoun reference also occurs when they, them, their, theirs, it, or its is used without its antecedent. They say that this nail polish dries in less than five minutes. The pronoun they is used without its antecedent, so the meaning of the sentence is unclear. This problem can be fixed by replacing the pronoun with its missing antecedent. The advertisements say that this nail polish dries in less than five minutes.
The first answer choice contains a vague pronoun reference. The pronoun she could refer to Sarah or Erica. Sarah asked Erica to make a flourless chocolate cake for their book club meeting because she has a gluten allergy. The second answer choice shows a possible correction for the vague pronoun reference. The text has been rewritten so that the meaning is clear. Because Erica has a gluten allergy, Sarah asked her to make a flourless chocolate cake for their book club meeting.
How long is a garden snail?
[ "38 kilometers", "38 millimeters", "38 meters", "38 centimeters" ]
1
Select the best estimate.
closed choice
grade6
natural science
units-and-measurement
Units and measurement
Choose metric units of distance, mass, and volume
Measurements are written with both a number and a unit. The unit comes after the number. The unit shows what the number means. When you are using metric units, length can be written with units of millimeters, centimeters, meters, or kilometers. One meter contains 100 centimeters or 1,000 millimeters. So, 1 meter is larger than 1 centimeter, and 1 centimeter is larger than 1 millimeter. The tip of the pencil shown here is only 1 millimeter wide, but the pencil is about 16 centimeters long. A red fox is about 1 meter long. The Sydney Harbour Bridge in Australia is about 1,000 meters, or 1 kilometer, in length.
The best estimate for the length of a garden snail is 38 millimeters. 38 centimeters, 38 meters, and 38 kilometers are all too long.
Is the following trait inherited or acquired? Finn has naturally blond hair.
[ "inherited", "acquired" ]
0
Hint: Some people dye their hair. But this does not change their natural hair color.
closed choice
grade3
natural science
biology
Heredity
Identify inherited and acquired traits
Organisms, including people, have both inherited and acquired traits. Inherited and acquired traits are gained in different ways. Inherited traits are passed down through families. Children gain these traits from their parents. Inherited traits do not need to be learned. Acquired traits are gained during a person's life. Some acquired traits, such as riding a bicycle, are gained by learning. Other acquired traits, such as scars, are caused by the environment. Children do not inherit their parents' acquired traits.
Humans do not choose their natural hair color. Instead, children get their natural hair color from their parents. So, Finn's hair color is an inherited trait.
What is the source of the allusion in the sentence below? Darnel described the situation he was facing with his boss as a catch-22.
[ "a song", "literature" ]
1
closed choice
grade10
language science
figurative-language
Literary devices
Recall the source of an allusion
An allusion is a brief mention of something or someone well known, often from mythology, history, or literature. An allusion lets you reference ideas from an entire story in just a few words. "I'd better get home before I turn into a pumpkin!" Lila remarked. Here, Lila alludes to the fairy tale "Cinderella," in which Cinderella must leave the ball before the coach that brought her transforms into a pumpkin. The allusion shows that Lila must depart immediately.
The source of the allusion catch-22 is literature. Joseph Heller coined the term "catch-22" in his 1961 novel of the same name. In the novel, if an army pilot wants to avoid dangerous missions, he must be deemed mentally unfit; however, his desire to stay safe proves his sanity, so he can never be excused from a mission. Heller called this sort of predicament or dilemma a catch-22. The allusion catch-22 means a no-win situation.
What is the volume of a teakettle?
[ "9 cups", "9 gallons", "9 fluid ounces" ]
0
Select the best estimate.
closed choice
grade5
natural science
units-and-measurement
Units and measurement
Choose customary units of volume
Measurements are written with both a number and a unit. The unit comes after the number. The unit shows what the number means. Volume is a measurement of how much space something takes up. There are many different units of volume. When you are using customary units, volume may be written in units of fluid ounces, cups, or gallons. As the diagram shows, there are 8 fluid ounces in 1 cup and 16 cups in 1 gallon. So, 1 fluid ounce is less than 1 cup and much less than 1 gallon. A glass of milk has a volume of about 8 fluid ounces, or 1 cup. A jug of milk has a volume of 1 gallon.
The best estimate for the volume of a teakettle is 9 cups. 9 fluid ounces is too little and 9 gallons is too much.
Which tense does the sentence use? Sue orders a roast beef sandwich.
[ "present tense", "future tense", "past tense" ]
0
closed choice
grade3
language science
verbs
Verb tense
Is the sentence in the past, present, or future tense?
Present tense verbs tell you about something that is happening now. Most present-tense verbs are regular. They have no ending, or they end in -s or -es. Two verbs are irregular in the present tense, to be and to have. You must remember their forms. Past tense verbs tell you about something that has already happened. Most past-tense verbs are regular. They end in -ed. Some verbs are irregular in the past tense. You must remember their past-tense forms. Future tense verbs tell you about something that is going to happen. All future-tense verbs use the word will. Present | Past | Future walk, walks | walked | will walk go, goes | went | will go
The sentence is in present tense. You can tell because it uses a present-tense verb, orders. The verb ends in -s and tells you about something that is true or happening now.
Select the one animal that has all of the mammal traits listed above.
[ "Black howler monkeys have loud calls, or howls. The howls can be heard over three miles away! Howler monkeys have fur and feed their offspring milk.", "Smooth newts have moist, smooth skin with black spots. Young smooth newts hatch from eggs without shells. They live in streams or ponds until they are about ten weeks old. Then, they crawl onto land." ]
0
Mammals are a group of animals with similar traits. The following traits can be used to identify mammals: They feed their offspring milk. They have fur or hair. Observe the animals and read the descriptions.
closed choice
grade5
natural science
biology
Classification
Use evidence to classify mammals, birds, fish, reptiles, and amphibians
Scientists sort animals with similar traits into groups. This is called classification. Classification helps scientists learn about how animals live. How do scientists classify animals? First, they make observations about an animal. Scientists observe the animal's traits, including its body parts and behavior. Then, scientists compare the animal's traits to other animals' traits. Scientists classify animals with similar traits into a group.
To decide if an animal is part of a group, look at the traits of the group. Mammals have the following traits: They feed their offspring milk. They have fur or hair. Compare each animal's traits to the group's traits. Select the animal with traits similar to the group's traits. A smooth newt has the following traits: It spends part of its life in water and part on land. It has moist skin. It makes eggs with no shells. A smooth newt does not have all of the traits of a mammal. A smooth newt is an amphibian. A black howler has the following traits: It feeds its offspring milk. It has fur. A black howler has the traits of a mammal. A black howler is a mammal.
Which closing is correct for a letter?
[ "Many thanks,\nLeslie", "many thanks,\nLeslie" ]
0
closed choice
grade3
language science
punctuation
Formatting
Greetings and closings of letters
A letter starts with a greeting and ends with a closing. For each one, capitalize the first word and end with a comma. You should also capitalize proper nouns, such as Aunt Sue. Dear Aunt Sue, I'm glad you could come to my party, and thank you for the birthday gift. I could not have asked for a better one! Every time I see it, I think of you. With love, Rory
The second closing is correct: Its first word is capitalized, and it ends with a comma.
Which sentence states a fact?
[ "The sitting U.S. president's airplane, Air Force One, is the most important symbol of the American government.", "It costs over two hundred thousand dollars per hour to fly Air Force One, the official airplane of the President of the United States." ]
1
closed choice
grade6
language science
writing-strategies
Developing and supporting arguments
Distinguish facts from opinions
A fact is something that can be proved by research or observation. Napoleon Bonaparte was shorter than King Louis XVI. The statement above is a fact. The statement can be proved by researching the height of each man and comparing them. An opinion is something that a person believes, thinks, or feels. An opinion cannot be proved. Napoleon Bonaparte was a better leader than King Louis XVI. The statement above is an opinion. People can have different ideas about what makes someone a "better" leader, so the statement cannot be proved.
The second sentence states a fact. It costs over two hundred thousand dollars per hour to fly Air Force One, the official airplane of the President of the United States. It can be proved by reading about Air Force One on the White House website. The first sentence states an opinion. The sitting U.S. president's airplane, Air Force One, is the most important symbol of the American government. Most shows what a person believes, thinks, or feels. Another person might have a different opinion about which symbol of the American government is most important.
Compare the motion of three sailboats. Which sailboat was moving at the lowest speed?
[ "a sailboat that moved 65kilometers west in 10hours", "a sailboat that moved 55kilometers north in 10hours", "a sailboat that moved 90kilometers east in 10hours" ]
1
closed choice
grade3
natural science
physics
Force and motion
Compare the speeds of moving objects
An object's speed tells you how fast the object is moving. Speed depends on both distance and time. Distance tells you how far the object has moved. One unit used to measure distance is the kilometer. Time tells you how long the object has spent moving. One unit used to measure time is the hour. Think about objects moving for the same amount of time. The object that is moving the slowest will go the shortest distance in that time. It is moving at the lowest speed.
Look at the distance each sailboat moved and the time it took to move that distance. The direction each sailboat moved does not affect its speed. Notice that each sailboat moved for 10 hours. The sailboat that moved 55 kilometers moved the shortest distance in that time. So, that sailboat must have moved at the lowest speed.
Which is a compound sentence?
[ "The weather might be nice, or it could start to rain.", "The beavers gnaw on logs by the riverbank." ]
0
closed choice
grade3
language science
grammar
Sentences, fragments, and run-ons
Is the sentence simple or compound?
A simple sentence is a sentence with only one subject and predicate. The pitcher threw the ball to first base. A compound sentence is two simple sentences joined by a comma and a conjunction such as and, but, or, or so. The pitcher threw the ball, and the batter hit it. Some simple sentences have a compound subject or a compound predicate, but they are not compound sentences. Anna and James will watch the fireworks tonight. This simple sentence has a compound subject, Anna and James. The singers bowed and walked off the stage. This simple sentence has a compound predicate, bowed and walked off the stage. Some simple sentences have introductory phrases, but they are not compound sentences. The introductory phrase is part of the predicate. In the winter, Farmer Ben wears his heavy coat. This is a simple sentence. There is one subject, Farmer Ben, and one predicate, wears his heavy coat in the winter.
The first sentence is the compound sentence. It is made up of two simple sentences joined by a comma and the conjunction or. The weather might be nice, or it could start to rain.
What information supports the conclusion that Tim inherited this trait?
[ "Tim's biological mother has long hair. Tim also has long hair.", "Tim uses a headband to keep his wavy hair out of his face.", "Tim's biological parents have wavy hair." ]
2
Read the description of a trait. Tim has wavy hair.
closed choice
grade8
natural science
biology
Genes to traits
Inherited and acquired traits: use evidence to support a statement
Organisms, including people, have both inherited and acquired traits. Inherited and acquired traits are gained in different ways. Inherited traits are passed down from biological parents to their offspring through genes. Genes are pieces of hereditary material that contain the instructions that affect inherited traits. Offspring receive their genes, and therefore gain their inherited traits, from their biological parents. Inherited traits do not need to be learned. Acquired traits are gained during a person's life. Some acquired traits, such as riding a bicycle, are gained by learning. Other acquired traits, such as scars, are caused by the environment. Parents do not pass acquired traits down to their offspring.
All organisms need food for energy. But how does an organism's body actually get energy out of food? Select the true statement.
[ "Cells usually take in large food molecules.", "Cells use energy to promote the organism's growth." ]
1
Food supplies an organism with many small, energy-rich molecules. These molecules are taken in by the organism's cells. Inside cells, the molecules from food are broken down to release energy that cells can use. This energy powers cell processes that allow the entire organism to grow and live.
closed choice
grade8
natural science
chemistry
Biochemistry
Understanding the chemistry of cellular respiration
What kind of sentence is this? Besides being the seat of our national government, Washington, D.C., is home to an impressive array of free museums.
[ "declarative", "interrogative", "exclamatory" ]
0
closed choice
grade9
language science
punctuation
Sentences, fragments, and run-ons
Is the sentence declarative, interrogative, imperative, or exclamatory?
There are four kinds of sentences. A declarative sentence is a statement and always ends with a period. The nurse told Mr. Abrams to roll up his sleeve so that she could check his blood pressure. An imperative sentence makes a request or a demand and usually ends with a period. If a demand shows strong feeling, it can end with an exclamation point. For this assignment, use references to support your claims. Don't drive so quickly in the construction zone! An interrogative sentence asks a question and always ends with a question mark. Given the recent critiques of her new strategic plan, do you think the CEO will reconsider the company's direction? An exclamatory sentence is a statement that shows surprise or strong feeling. An exclamation always ends with an exclamation point. I can't wait to travel through Europe this summer!
The sentence is a statement and ends with a period. It is a declarative sentence.
What kind of sentence is this? Does Helen have any hobbies?
[ "interrogative", "exclamatory" ]
0
closed choice
grade5
language science
punctuation
Sentences, fragments, and run-ons
Is the sentence declarative, interrogative, imperative, or exclamatory?
There are four kinds of sentences. A declarative sentence is a statement. It tells about something. A declarative sentence always ends with a period. I have an older brother and a younger sister. An interrogative sentence is a question. It asks something. An interrogative sentence always ends with a question mark. How tall are you? An imperative sentence is a command. It makes a request or tells someone to do something. An imperative sentence usually ends with a period. If the command shows strong feeling, it ends with an exclamation point. Read the first chapter by next week. Look out for that car! An exclamatory sentence is like a statement, but it shows surprise or strong feeling. An exclamatory sentence always ends with an exclamation point. Some whales are over ninety feet long! I can't wait until tomorrow!
The sentence asks something, and it ends with a question mark. It is an interrogative sentence.
What information supports the conclusion that Bernard acquired this trait?
[ "Bernard's scar was caused by an accident. He cut his leg when he fell off his skateboard.", "Bernard's scar is on his left knee. His mother also has a scar on her left knee.", "Bernard's brother has scars on both of his knees." ]
0
Read the description of a trait. Bernard has a scar on his left knee.
closed choice
grade8
natural science
biology
Genes to traits
Inherited and acquired traits: use evidence to support a statement
Organisms, including people, have both inherited and acquired traits. Inherited and acquired traits are gained in different ways. Inherited traits are passed down from biological parents to their offspring through genes. Genes are pieces of hereditary material that contain the instructions that affect inherited traits. Offspring receive their genes, and therefore gain their inherited traits, from their biological parents. Inherited traits do not need to be learned. Acquired traits are gained during a person's life. Some acquired traits, such as riding a bicycle, are gained by learning. Other acquired traits, such as scars, are caused by the environment. Parents do not pass acquired traits down to their offspring.
Which of the following contains a vague pronoun reference?
[ "Sarah asked Julia to make a flourless chocolate cake for their book club meeting because she has a gluten allergy.", "Because Julia has a gluten allergy, Sarah asked her to make a flourless chocolate cake for their book club meeting." ]
0
closed choice
grade11
language science
writing-strategies
Pronouns
Identify vague pronoun references
When writing, make sure to avoid vague pronoun references. A vague pronoun reference occurs when a pronoun could refer to more than one possible antecedent. When Lisa and Kim finally landed, she breathed a sigh of relief. The pronoun she could refer to either Lisa or Kim, so the meaning of the sentence is unclear. Vague pronoun references can be corrected in one of two ways: 1. Replace the pronoun with its correct antecedent: When Lisa and Kim finally landed, Lisa breathed a sigh of relief. 2. Rewrite the sentence: Lisa breathed a sigh of relief when she and Kim finally landed. A vague pronoun reference also occurs when they, them, their, theirs, it, or its is used without its antecedent. They say that this nail polish dries in less than five minutes. The pronoun they is used without its antecedent, so the meaning of the sentence is unclear. This problem can be fixed by replacing the pronoun with its missing antecedent. The advertisements say that this nail polish dries in less than five minutes.
The second answer choice contains a vague pronoun reference. The pronoun she could refer to Sarah or Julia. Sarah asked Julia to make a flourless chocolate cake for their book club meeting because she has a gluten allergy. The first answer choice shows a possible correction for the vague pronoun reference. The text has been rewritten so that the meaning is clear. Because Julia has a gluten allergy, Sarah asked her to make a flourless chocolate cake for their book club meeting.
Compare the motion of two motorboats. Which motorboat was moving at a lower speed?
[ "a motorboat that moved 265kilometers in 10hours", "a motorboat that moved 505kilometers in 10hours" ]
0
closed choice
grade2
natural science
physics
Force and motion
Compare the speeds of moving objects
An object's speed tells you how fast the object is moving. Speed depends on both distance and time. Distance tells you how far the object has moved. One unit used to measure distance is the kilometer. Time tells you how long the object has spent moving. One unit used to measure time is the hour. Think about two objects moving for the same amount of time. The object that is moving slower will go a shorter distance in that time. It is moving at a lower speed.
Look at the distance each motorboat moved and the time it took to move that distance. One motorboat moved 265 kilometers in 10 hours. The other motorboat moved 505 kilometers in 10 hours. Notice that each motorboat spent the same amount of time moving. The motorboat that moved 265 kilometers moved a shorter distance in that time. So, that motorboat must have moved at a lower speed.
Complete the sentence so that it uses personification. In the middle of the grueling hike, I encountered a bubbling stream that () me to stop for a drink.
[ "enabled", "invited" ]
1
closed choice
grade8
language science
writing-strategies
Creative techniques
Use personification
Personification is giving human characteristics to nonhuman things. It is a figure of speech that can be used to make writing more interesting or to emphasize a point. The trees danced in the wind. The word danced describes the trees as if they were people. Unlike people, however, trees can't actually dance. Instead, the personification suggests that the trees are moving.
Complete the sentence with the word invited. It describes the stream as if it were a person who offers an invitation.
Answer the riddle. You can eat me. I am sweet. Bees make me. What am I?
[ "ice cream", "honey" ]
1
closed choice
grade1
language science
vocabulary
Comprehension strategies
What am I?
You can eat honey. Honey is sweet. Bees make honey.
Select the animal.
[ "Redwood trees have small leaves.", "Aloe vera has spiny leaves.", "Oak trees can have thick branches.", "Koalas eat leaves." ]
3
closed choice
grade3
natural science
biology
Classification
Identify plants and animals
Plants and animals are living things. Living things are called organisms. Plants come in many shapes and sizes. Most plants grow in the ground. They might grow leaves, flowers, and fruit. Plants cannot move around on their own like animals can. Animals also come in many shapes and sizes. Most animals can move around. Animals might run, swim, jump, or fly. Animals eat plants or other organisms for food.
Aloe vera is a plant. It has spiny leaves. Aloe vera leaves contain a watery liquid. People use this liquid in lotion and medicine. An oak tree is a plant. It can have thick branches. Acorns grow on oak trees. Acorns are small nuts with a seed inside. A redwood tree is a plant. It has small leaves. Redwood trees have fuzzy reddish-brown bark. Their bark helps protect redwood trees from fires. A koala is an animal. It eats leaves. Koalas spend most of their time in trees. They sleep for up to 20 hours a day!
Which object has the most thermal energy?
[ "a 200-gram cup of black tea at a temperature of 56°C", "a 200-gram cup of black tea at a temperature of 41°C", "a 200-gram cup of black tea at a temperature of 39°C" ]
0
The objects are identical except for their temperatures.
closed choice
grade4
natural science
physics
Heat and thermal energy
How is temperature related to thermal energy?
All solids, liquids, and gases are made of matter. Matter is made up of tiny particles that are always moving. The energy from the motion of these particles is called thermal energy. Temperature measures how hot or cold matter is. If the particles in matter move faster, the temperature goes up. The matter now has both more thermal energy and a higher temperature.
All three cups of black tea have the same mass but different temperatures. Since the 56°C cup of black tea is the hottest, it has the most thermal energy.
Which word is not like the others?
[ "house", "apartment", "road", "cabin" ]
2
closed choice
grade2
language science
vocabulary
Categories
Which word is not like the others?
Some words are alike. They go together in a group. Red, blue, and green go together. They are colors. Mom, dad, grandma, and grandpa go together. They are people in a family.
House, apartment, and cabin go together. They are places to live. Road is not a place to live, so it is not like the other words.
Which logical fallacy is used in the text? I don't trust Professor Stewart's findings. Another researcher at her university was caught falsifying data. So, it's likely Professor Stewart has, too.
[ "circular reasoning: an argument that supports a claim with the claim itself", "slippery slope fallacy: the false assumption that a small first step will lead to extreme consequences", "guilt by association: a negative association intended to discredit someone or something" ]
2
closed choice
grade9
language science
writing-strategies
Developing and supporting arguments
Classify logical fallacies
A strong argument uses valid reasoning and logic in support of a claim. When an argument or claim introduces irrelevant information or misrepresents the issues at hand, it may be committing a logical fallacy. Logical fallacies can hurt a writer's credibility and can lead readers to draw false conclusions. A logical fallacy may present irrelevant information: Fallacy | Description ad hominem | an attack against the person making the argument, rather than the argument itself appeal to nature | an argument that assumes the natural choice is always the best choice bandwagon fallacy | an argument that assumes the popular choice is always the best choice circular reasoning | an argument that supports a claim with the claim itself guilt by association | an unfair negative association with another person or group that is intended to discredit someone or something A logical fallacy may misrepresent the issues at hand: Fallacy | Description false causation | the assumption that because two things happened together, one caused the other false dichotomy | an argument that presents only two choices when more options exist hasty generalization | a broad claim based on too few observations slippery slope fallacy | the false assumption that a small first step will necessarily lead to extreme consequences straw man | a misrepresentation of an opponent's position that makes it easier to argue against
The text argues that Professor Stewart's research is untrustworthy because someone else at her university was caught falsifying data. However, this isn't necessarily true. The practices of one researcher at a university do not necessarily reflect the practices of another researcher at the same university. This illustrates a type of logical fallacy known as guilt by association.
Which of the following contains a vague pronoun reference?
[ "After scouring the classified ads for days, Paul finally found a used car that fit his budget. The sedan had Bluetooth, but it needed to be fixed.", "After scouring the classified ads for days, Paul finally found a used car that fit his budget. The sedan needed to be fixed, but it had Bluetooth." ]
0
closed choice
grade10
language science
writing-strategies
Pronouns
Identify vague pronoun references
When writing, make sure to avoid vague pronoun references. A vague pronoun reference occurs when a pronoun could refer to more than one possible antecedent. When Lisa and Kim finally landed, she breathed a sigh of relief. The pronoun she could refer to either Lisa or Kim, so the meaning of the sentence is unclear. Vague pronoun references can be corrected in one of two ways: 1. Replace the pronoun with its correct antecedent: When Lisa and Kim finally landed, Lisa breathed a sigh of relief. 2. Rewrite the sentence: Lisa breathed a sigh of relief when she and Kim finally landed. A vague pronoun reference also occurs when they, them, their, theirs, it, or its is used without its antecedent. They say that this nail polish dries in less than five minutes. The pronoun they is used without its antecedent, so the meaning of the sentence is unclear. This problem can be fixed by replacing the pronoun with its missing antecedent. The advertisements say that this nail polish dries in less than five minutes.
The first answer choice contains a vague pronoun reference. The pronoun it could refer to the sedan or Bluetooth. After scouring the classified ads for days, Paul finally found a used car that fit his budget. The sedan had Bluetooth, but it needed to be fixed. The second answer choice shows a possible correction for the vague pronoun reference. The text has been rewritten so that the meaning is clear. After scouring the classified ads for days, Paul finally found a used car that fit his budget. The sedan needed to be fixed, but it had Bluetooth.
What is the volume of armos?
[ "4 fluid ounces", "4 gallons", "4 cups" ]
2
Select the best estimate.
closed choice
grade5
natural science
units-and-measurement
Units and measurement
Choose customary units of volume
Measurements are written with both a number and a unit. The unit comes after the number. The unit shows what the number means. Volume is a measurement of how much space something takes up. There are many different units of volume. When you are using customary units, volume may be written in units of fluid ounces, cups, or gallons. As the diagram shows, there are 8 fluid ounces in 1 cup and 16 cups in 1 gallon. So, 1 fluid ounce is less than 1 cup and much less than 1 gallon. A glass of milk has a volume of about 8 fluid ounces, or 1 cup. A jug of milk has a volume of 1 gallon.
The best estimate for the volume of a thermos is 4 cups. 4 fluid ounces is too little and 4 gallons is too much.
Which object has the most thermal energy?
[ "a blueberry muffin at a temperature of 101°F", "a blueberry muffin at a temperature of 70°F", "a blueberry muffin at a temperature of 89°F" ]
0
The objects are identical except for their temperatures.
closed choice
grade4
natural science
physics
Heat and thermal energy
How is temperature related to thermal energy?
All solids, liquids, and gases are made of matter. Matter is made up of tiny particles that are always moving. The energy from the motion of these particles is called thermal energy. Temperature measures how hot or cold matter is. If the particles in matter move faster, the temperature goes up. The matter now has both more thermal energy and a higher temperature.
All three blueberry muffins have the same mass but different temperatures. Since the 101°F muffin is the hottest, it has the most thermal energy.
Based on this information, what is this trout's phenotype for the body color trait?
[ "a blue body", "a greenish-brown body" ]
0
In a group of rainbow trout, some individuals have a greenish-brown body and others have a blue body. In this group, the gene for the body color trait has two alleles. The allele for a greenish-brown body (B) is dominant over the allele for a blue body (b). A certain rainbow trout from this group has the homozygous genotype bb for the body color gene.
closed choice
grade7
natural science
biology
Genes to traits
Genetics vocabulary: dominant and recessive
All organisms have pieces of hereditary material called genes, which are passed from parents to offspring. Genes contain instructions for building the parts of an organism. An organism's genes affect its observable traits, including its appearance, its behavior, and which diseases it may have. Genes may have different alleles, or forms, that can cause different versions of a trait. For example, flower color is a trait in pea plants. The gene for this trait has two possible alleles. Each allele is represented by an uppercase or lowercase letter. The allele F is for purple flowers, and the allele f is for white flowers. Each pea plant has two alleles for the flower color gene—one allele inherited from each parent. An organism's genotype for a gene is its combination of alleles for that gene. So, a pea plant may have a genotype of FF, Ff, or ff for the flower color gene. An organism's phenotype for a trait is its observable version of that trait, which depends on the organism's combination of alleles. A pea plant may have a phenotype of purple flowers or white flowers for the flower color trait. Some traits, like flower color in pea plants, are controlled by a single gene. Most plants and animals have a genotype made up of two alleles for these traits. These two alleles determine whether an organism is homozygous or heterozygous for the gene. An organism with two identical alleles for a gene is homozygous for that gene. A pea plant with the genotype FF or ff is homozygous for the flower color gene. An organism with two different alleles for a gene is heterozygous for that gene. A pea plant with the genotype Ff is heterozygous for the flower color gene. The types of alleles in an organism's genotype determine the organism's phenotype. Some alleles have types called dominant and recessive. These two types can cause different versions of a trait to appear as the organism's phenotype. A dominant allele causes its version of the trait to appear even when the organism also has a recessive allele for the gene. In pea plants, the F allele, which causes purple flowers, is dominant over the f allele. A pea plant with at least one F allele will have the F allele's version of the flower color trait. So, a plant with the genotype FF or Ff will have purple flowers. A recessive allele causes its version of the trait to appear only when the organism does not have any dominant alleles for the gene. In pea plants, the f allele, which causes white flowers, is recessive to the F allele. A pea plant with only f alleles will have the f allele's version of the flower color trait. So, a plant with the genotype ff will have white flowers.
The rainbow trout's genotype for the body color gene is bb. The rainbow trout's genotype of bb has only b alleles. The b allele is for a blue body. So, the rainbow trout's phenotype for the body color trait must be a blue body. To check this answer, consider whether the rainbow trout's alleles are dominant or recessive. The allele for a greenish-brown body (B) is dominant over the allele for a blue body (b). This means B is a dominant allele, and b is a recessive allele. The rainbow trout's genotype of bb has only recessive alleles. An organism with only recessive alleles for a gene will have the recessive allele's version of the trait. So, the rainbow trout's phenotype for the body color trait must be a blue body.
Which glas of water has a lower temperature?
[ "the glass of water with more thermal energy", "the glass of water with less thermal energy" ]
1
Two 400-gram glasses of water are identical except for their thermal energies.
closed choice
grade6
natural science
physics
Thermal energy
How are temperature and mass related to thermal energy?
Matter is made of tiny particles called atoms. Atoms are always moving. The energy of moving atoms is called thermal energy. The total amount of thermal energy in matter depends on three things: the type of matter, the amount of matter, and how fast the atoms are moving. Temperature measures how hot or cold matter is. If the atoms in matter slow down, the temperature goes down. The matter now has both less thermal energy and a lower temperature. What happens if the amount of matter changes? A 2-kilogram brick at 70°F has twice as much thermal energy as a 1-kilogram brick at 70°F. The two bricks have the same temperature, but the larger brick has twice as many atoms. So, it has twice as much thermal energy.
The two glasses of water are made of the same material and have the same mass. So, the glass of water with less thermal energy has a lower temperature.
Which type of sentence is this? Raymond always approaches difficult tasks enthusiastically, and he frequently motivates others with his energy and fervor.
[ "simple", "compound", "complex", "compound-complex" ]
1
closed choice
grade9
language science
grammar
Phrases and clauses
Is the sentence simple, compound, complex, or compound-complex?
A clause is a group of words that contains both a subject and a predicate. An independent clause is a complete thought that can stand alone as a sentence. A dependent clause (or subordinate clause) is not a complete thought and cannot stand alone as a sentence. the oranges on our tree are ripe The clause can stand alone. It is independent. after we pick up Kevin from work The clause cannot stand alone. It is dependent. A simple sentence is made up of a single independent clause. Ben and I spent all day relaxing by the pool. Some simple sentences have introductory phrases, but the introductory phrase is part of the predicate. In the winter, Ben usually wears his heavy coat. Ben usually wears his heavy coat in the winter. A compound sentence is made up of two independent clauses joined by a coordinating conjunction such as and, but, or, or so. We saw the flash of lightning, and seconds later we heard a rumble of thunder. A complex sentence is made up of an independent clause and a dependent clause. The dependent clause in a complex sentence usually begins with a subordinating conjunction or relative pronoun. Subordinating conjunctions include after, although, as, because, before, if, since, unless, until, when, and while. Relative pronouns include that, which, who, whom, or whose. If she ever gets the chance, Terri would love to visit the Egyptian pyramids. During his trip to Italy, Tony visited the Trevi Fountain, which is in Rome. A compound-complex sentence is made up of two or more independent clauses and one or more dependent clauses. After Samantha left work, she stopped at the bank, and then she went to the gym. Sometimes a dependent clause in a complex or compound-complex sentence can interrupt an independent clause. Orcas that are kept in captivity often have bent dorsal fins.
The sentence is compound. It is made up of two independent clauses joined by the coordinating conjunction and. Raymond always approaches difficult tasks enthusiastically, and he frequently motivates others with his energy and fervor.
What kind of sentence is this? That huge cruise ship even has a small amusement park on it!
[ "exclamatory", "declarative", "interrogative" ]
0
closed choice
grade6
language science
punctuation
Sentences, fragments, and run-ons
Is the sentence declarative, interrogative, imperative, or exclamatory?
There are four kinds of sentences. A declarative sentence is a statement, and it always ends with a period. The nurse told Mr. Abrams to roll up his sleeve so that she could check his blood pressure. An interrogative sentence is a question, and it always ends with a question mark. Do you have any plans for the upcoming weekend? An imperative sentence is a command. It makes a request or tells someone to do something, and it usually ends with a period. If the command shows strong feeling, it ends with an exclamation point. For this assignment, use references to support your claims. Don't drive so quickly in the construction zone! An exclamatory sentence is like a statement, but it shows surprise or strong feeling. An exclamatory sentence always ends with an exclamation point. I can't wait to travel through Europe this summer!
The sentence tells about something, but it shows surprise and ends with an exclamation point. It is an exclamatory sentence.
How long does it take to tie your shoes?
[ "21 minutes", "21 seconds" ]
1
Select the better estimate.
closed choice
grade2
natural science
units-and-measurement
Units and measurement
Choose units of time
Measurements are written with both a number and a unit. The unit comes after the number. The unit shows what the number means. Imagine being told that the bus leaves in 7. You might be thinking, 7 what? Does the bus leave in 7 minutes? 7 seconds? The number 7 on its own does not give you much information about when the bus is leaving. That is because the units are missing. Time is usually measured in units of seconds, minutes, or hours. It takes about 1 second to sneeze and 1 minute to get dressed in the morning. It takes about 1 hour to bake a pie in the oven. There are 60 seconds in 1 minute. So, 1 second is much less than 1 minute. There are 60 minutes in 1 hour. So, 1 minute is much less than 1 hour.
The better estimate for how long it takes to tie your shoes is 21 seconds. 21 minutes is too slow.
Which greeting is correct for a letter?
[ "Dear Patty,", "dear Patty," ]
0
closed choice
grade3
language science
punctuation
Formatting
Greetings and closings of letters
A letter starts with a greeting and ends with a closing. For each one, capitalize the first word and end with a comma. You should also capitalize proper nouns, such as Aunt Sue. Dear Aunt Sue, I'm glad you could come to my party, and thank you for the birthday gift. I could not have asked for a better one! Every time I see it, I think of you. With love, Rory
The second greeting is correct: Its first word is capitalized, and it ends with a comma. Patty is capitalized because it is a proper noun.
Which figure of speech is used in this text? You've reached Adam Cheng's voice mail. Please leave a detailed message at the beep, and I will return your call at my earliest convenience.
[ "verbal irony", "onomatopoeia" ]
1
closed choice
grade6
language science
figurative-language
Literary devices
Classify figures of speech
Figures of speech are words or phrases that use language in a nonliteral or unusual way. They can make writing more expressive. Alliteration is the repetition of sounds at the beginning of nearby words. What a lucky little lady you are! An allusion is a brief reference to something or someone well known, often from history or literature. "I'd better get home before I turn into a pumpkin!" Lila remarked. An idiom is an expression that cannot be understood literally. Its meaning must be learned. The assignment was a piece of cake. A simile uses like or as to compare two things that are not actually alike. The cat's fur was as dark as the night. A metaphor compares two things that are not actually alike without using like or as. The snow formed a blanket over the town. Onomatopoeia involves using a word that expresses a sound. The scrambled eggs hit the floor with a splat. Personification is giving human characteristics to nonhuman things. The trees danced in the wind. A pun involves using a word or phrase in a humorous way that suggests more than one meaning. A great new broom is sweeping the nation. Verbal irony involves saying one thing but implying something very different. People often use verbal irony when they are being sarcastic. Olivia seems thrilled that her car keeps breaking down. Each breakdown is as enjoyable as a punch to the face.
The text uses onomatopoeia, a word that expresses a sound. Beep represents the sound that tells the caller to start recording a message.
What kind of sentence is this? Do you know Donald from soccer camp, or do you have another connection with him?
[ "imperative", "interrogative", "declarative" ]
1
closed choice
grade7
language science
punctuation
Sentences, fragments, and run-ons
Is the sentence declarative, interrogative, imperative, or exclamatory?
There are four kinds of sentences. A declarative sentence is a statement, and it always ends with a period. The nurse told Mr. Abrams to roll up his sleeve so that she could check his blood pressure. An interrogative sentence is a question, and it always ends with a question mark. Do you have any plans for the upcoming weekend? An imperative sentence is a command. It makes a request or tells someone to do something, and it usually ends with a period. If the command shows strong feeling, it ends with an exclamation point. For this assignment, use references to support your claims. Don't drive so quickly in the construction zone! An exclamatory sentence is like a statement, but it shows surprise or strong feeling. An exclamatory sentence always ends with an exclamation point. I can't wait to travel through Europe this summer!
The sentence asks something, and it ends with a question mark. It is an interrogative sentence.
What is the source of the allusion in the sentence below? Ted says that he would not be the person he is today were it not for his childhood, which he describes as Dickensian.
[ "a poem", "literature" ]
1
closed choice
grade10
language science
figurative-language
Literary devices
Recall the source of an allusion
An allusion is a brief mention of something or someone well known, often from mythology, history, or literature. An allusion lets you reference ideas from an entire story in just a few words. "I'd better get home before I turn into a pumpkin!" Lila remarked. Here, Lila alludes to the fairy tale "Cinderella," in which Cinderella must leave the ball before the coach that brought her transforms into a pumpkin. The allusion shows that Lila must depart immediately.
The source of the allusion Dickensian is literature. The works of British author Charles Dickens often featured characters struggling to survive in settings such as debtors' prisons and orphanages. The allusion Dickensian means harsh or poverty-stricken.
Is this a run-on sentence? In 1227, Genghis Khan, the Mongol leader who conquered much of Central Asia, died he was buried in an unmarked grave, and its location remains a mystery today.
[ "no", "yes" ]
1
yes or no
grade12
language science
writing-strategies
Sentences, fragments, and run-ons
Identify run-on sentences
A sentence is a group of words that expresses a complete thought. The band I'm in has been rehearsing daily because we have a concert in two weeks. A run-on sentence is formed when two sentences are run together, joined by just a comma or by no punctuation at all. If only a comma is used, the run-on is called a comma splice. The band I'm in has been rehearsing daily, we have a concert in two weeks. The band I'm in has been rehearsing daily we have a concert in two weeks. There are several ways to fix a run-on sentence: Use stronger punctuation, such as a period or a semicolon. The band I'm in has been rehearsing daily. We have a concert in two weeks. The band I'm in has been rehearsing daily; we have a concert in two weeks. Use a comma and a coordinating conjunction to create a compound sentence. Coordinating conjunctions include and, but, or, and so. The band I'm in has been rehearsing daily, and we have a concert in two weeks. Use a subordinating conjunction or a relative pronoun to create a complex sentence. Subordinating conjunctions include after, although, as, because, before, if, since, unless, until, when, and while. Relative pronouns include that, which, who, whom, and whose. The band I'm in has been rehearsing daily since we have a concert in two weeks.
This is a run-on sentence. It is formed from two sentences run together, joined without punctuation. In 1227, Genghis Khan, the Mongol leader who conquered much of Central Asia, died he was buried in an unmarked grave, and its location remains a mystery today. Here is one way to fix the run-on sentence: In 1227, Genghis Khan, the Mongol leader who conquered much of Central Asia, died. He was buried in an unmarked grave, and its location remains a mystery today.
Which of the following parts does an animal cell have?
[ "cytoplasm", "cell wall" ]
0
closed choice
grade4
natural science
biology
Cells
Compare plant and animal cells
Plant and animal cells have many parts in common, but not all. This table shows some of their similarities and differences. Cell part | Plant cell | Animal cell cell wall | yes | no cell membrane | yes | yes cytoplasm | yes | yes mitochondria | yes | yes vacuole | yes | yes chloroplasts | yes | no nucleus | yes | yes chromosomes | yes | yes Think about how plant and animal cells are different: Plant cells have a cell wall, but animal cells do not. The cell wall helps plant cells keep a fixed shape. Most animal cells do not have a fixed shape. Plant cells have chloroplasts, but animal cells do not. Chloroplasts make sugar that plants cells can use as food. Animal cells cannot make their own food.
Which word would you find on a dictionary page with the following guide words? salad - simple
[ "shriek", "steam" ]
0
closed choice
grade2
language science
reference-skills
Reference skills
Use guide words
Guide words appear on each page of a dictionary. They tell you the first word and last word on the page. The other words on the page come between the guide words in alphabetical order. To put words in alphabetical order, put them in order by their first letters. If the first letters are the same, look at the second letters. If the second letters are the same, look at the third letters, and so on.
Put the words in alphabetical order. Since shriek is between the guide words salad - simple, it would be found on that page.
What do these two changes have in common? a slice of banana turning brown burning a marshmallow over a campfire
[ "Both are caused by cooling.", "Both are only physical changes.", "Both are caused by heating.", "Both are chemical changes." ]
3
closed choice
grade8
natural science
chemistry
Chemical reactions
Compare physical and chemical changes
Matter is made of very small particles called atoms. Atoms can be linked together by chemical bonds. When two or more atoms link together, they form a molecule. In a chemical change, the chemical bonds in the molecules break. The atoms then link together to form different molecules. The types of molecules in matter before and after a chemical change are always different. Some chemical changes are caused by heating or cooling. For example, burning a piece of paper is a chemical change caused by heating. As paper burns, paper molecules react with oxygen molecules in the air. This reaction breaks the chemical bonds in the molecules. The atoms then link together in a different way to form different molecules. For example, carbon dioxide molecules are formed when paper burns. In a physical change, chemical bonds do not break. The types of molecules in matter before and after a physical change are always the same. A change of state is a type of physical change. Changes of state can be caused by heating or cooling. For example, water vaporizing is a physical change that can be caused by heating. Liquid water and water vapor are made of the same type of matter: water. The law of conservation of mass says that all physical and chemical changes conserve mass. Conserve means to keep the same. So, the total mass before a physical or chemical change is equal to the total mass after the change.
Step 1: Think about each change. A slice of banana turning brown is a chemical change. The part of the banana in contact with the air reacts with oxygen and turns into a different type of matter. Burning a marshmallow is a chemical change. The heat from the fire causes the type of matter in the marshmallow to change. The marshmallow becomes black and crispy. Step 2: Look at each answer choice. Both are only physical changes. Both changes are chemical changes. They are not physical changes. Both are chemical changes. Both changes are chemical changes. The type of matter before and after each change is different. Both are caused by heating. Burning is caused by heating. But a slice of banana turning brown is not. Both are caused by cooling. Neither change is caused by cooling.
What do these two changes have in common? burning food on a stove water boiling on a stove
[ "Both are caused by heating.", "Both are chemical changes.", "Both are only physical changes.", "Both are caused by cooling." ]
0
closed choice
grade3
natural science
chemistry
Physical and chemical change
Compare physical and chemical changes
Chemical changes and physical changes are two common ways matter can change. In a chemical change, the type of matter changes. The types of matter before and after a chemical change are always different. Some chemical changes are caused by heating or cooling. For example, burning a piece of paper is a chemical change caused by heating. When paper gets hot enough, it re­acts with oxygen in the air and burns. The paper and oxygen change into ash and smoke. In a physical change, the type of matter stays the same. The types of matter before and after a physical change are always the same. A change of state is a type of physical change. Changes of state can be caused by heating or cooling. For example, ice melting is a physical change that can be caused by heating. Ice and liquid water are made of the same type of matter: water. The law of conservation of mass says that all physical and chemical changes conserve mass. Conserve means to keep the same. So, the total mass before a physical or chemical change is equal to the total mass after the change.
Step 1: Think about each change. Food burning on a stove is a chemical change. The type of matter in the food changes. The food turns black and gives off smoke. Water boiling on the stove is a change of state. So, it is a physical change. The liquid changes into a gas, but a different type of matter is not formed. Step 2: Look at each answer choice. Both are only physical changes. Water boiling is a physical change. But burning food on a stove is not. Both are chemical changes. Burning food on a stove is a chemical change. But water boiling is not. Both are caused by heating. Both changes are caused by heating. Both are caused by cooling. Neither change is caused by cooling.
Select the action that doesn't belong.
[ "roast", "boil", "bake", "wash" ]
3
closed choice
grade3
language science
vocabulary
Categories
Select the words that don't belong
Wash doesn't belong. Bake, roast, and boil all name ways to cook things.
Select the one substance that is not a mineral.
[ "A computer processor is made in a factory. It is a solid.", "Native copper is a solid. It is a pure substance.", "Magnetite is a solid. It is a pure substance." ]
0
closed choice
grade4
natural science
earth-science
Rocks and minerals
Identify minerals using properties
Minerals are the building blocks of rocks. A rock can be made of one or more minerals. Minerals and rocks have the following properties: Property | Mineral | Rock It is a solid. | Yes | Yes It is formed in nature. | Yes | Yes It is not made by organisms. | Yes | Yes It is a pure substance. | Yes | No It has a fixed crystal structure. | Yes | No You can use these properties to tell whether a substance is a mineral, a rock, or neither. Look closely at the last three properties: Minerals and rocks are not made by organisms. Organisms make their own body parts. For example, snails and clams make their shells. Because they are made by organisms, body parts cannot be minerals or rocks. Humans are organisms too. So, substances that humans make by hand or in factories are not minerals or rocks. A mineral is a pure substance, but a rock is not. A pure substance is made of only one type of matter. Minerals are pure substances, but rocks are not. Instead, all rocks are mixtures. A mineral has a fixed crystal structure, but a rock does not. The crystal structure of a substance tells you how the atoms or molecules in the substance are arranged. Different types of minerals have different crystal structures, but all minerals have a fixed crystal structure. This means that the atoms and molecules in different pieces of the same type of mineral are always arranged the same way. However, rocks do not have a fixed crystal structure. So, the arrangement of atoms or molecules in different pieces of the same type of rock may be different!
Compare the properties of each substance to the properties of minerals. Select the substance whose properties do not match those of minerals. Native copper is a mineral. A computer processor is made in a factory. But all minerals are formed in nature. So, a computer processor is not a mineral. Magnetite is a mineral.
Based on this information, what is Felicia's genotype for the ear type gene?
[ "straight ears", "ee" ]
1
In a group of American curl cats, some individuals have curled ears and others have straight ears. In this group, the gene for the ear type trait has two alleles. The allele E is for curled ears, and the allele e is for straight ears. Felicia, an American curl cat from this group, has straight ears. Felicia has two alleles for straight ears.
closed choice
grade8
natural science
biology
Genes to traits
Genetics vocabulary: genotype and phenotype
All organisms have pieces of hereditary material called genes, which are passed from parents to offspring. Genes contain instructions for building the parts of an organism. An organism's genes affect its observable traits, including its appearance, its behavior, and which diseases it may have. Genes may have different alleles, or forms, that can cause different versions of a trait. For example, flower color is a trait in pea plants. The gene for this trait has two possible alleles. Each allele is represented by an uppercase or lowercase letter. The allele F is for purple flowers, and the allele f is for white flowers. Each pea plant has two alleles for the flower color gene—one allele inherited from each parent. An organism's genotype for a gene is its combination of alleles for that gene. So, a pea plant may have a genotype of FF, Ff, or ff for the flower color gene. An organism's phenotype for a trait is its observable version of that trait, which depends on the organism's combination of alleles. A pea plant may have a phenotype of purple flowers or white flowers for the flower color trait.
An organism's genotype for a gene is its combination of alleles for that gene. Felicia has two alleles for straight ears (e). So, Felicia's genotype for the ear type gene is ee.
Which sentence states a fact?
[ "The region north of the Arctic Circle is the most miserable place on earth.", "North of the Arctic Circle, there are days when the sun does not completely rise or set." ]
1
closed choice
grade5
social science
civics
Social studies skills
Identify facts and opinions
A fact is something that can be proved to be true. Facts can be proved by observing, measuring, or studying information. The flag of the United States has 13 stripes. This is a fact. It can be proved by looking at the flag and counting the number of stripes. An opinion is something that a person believes, thinks, or feels. An opinion cannot be proved true. The flag of the United States is easy to draw. This is an opinion. People may have different opinions about what makes a flag "easy" to draw.
The second sentence states a fact. North of the Arctic Circle, there are days when the sun does not completely rise or set. It can be proved by looking up information about the Arctic Circle. The first sentence states an opinion. The region north of the Arctic Circle is the most miserable place on earth. Most miserable shows what a person believes, thinks, or feels. Another person might have a different opinion about what makes a place miserable.
Which figure of speech is used in this text? After Gabrielle cooked and served a scrumptious dinner, Dad boasted that she is the Julia Child of our family.
[ "allusion", "pun" ]
0
closed choice
grade7
language science
figurative-language
Literary devices
Classify figures of speech
Figures of speech are words or phrases that use language in a nonliteral or unusual way. They can make writing more expressive. Alliteration is the repetition of sounds at the beginning of nearby words. What a lucky little lady you are! An allusion is a brief reference to something or someone well known, often from history or literature. "I'd better get home before I turn into a pumpkin!" Lila remarked. An idiom is an expression that cannot be understood literally. Its meaning must be learned. The assignment was a piece of cake. A simile uses like or as to compare two things that are not actually alike. The cat's fur was as dark as the night. A metaphor compares two things that are not actually alike without using like or as. The snow formed a blanket over the town. Onomatopoeia involves using a word that expresses a sound. The scrambled eggs hit the floor with a splat. Personification is giving human characteristics to nonhuman things. The trees danced in the wind. A pun involves using a word or phrase in a humorous way that suggests more than one meaning. A great new broom is sweeping the nation. Verbal irony involves saying one thing but implying something very different. People often use verbal irony when they are being sarcastic. Olivia seems thrilled that her car keeps breaking down. Each breakdown is as enjoyable as a punch to the face.
The text uses an allusion, a brief reference to someone or something well known. Julia Child alludes to the famous chef who is known for popularizing French cuisine in the United States.
Which professional objective on a résumé is more formal?
[ "I want a job where I can travel a lot and hopefully manage people someday.", "I seek a position with opportunities for travel and advancement." ]
1
closed choice
grade11
language science
writing-strategies
Audience, purpose, and tone
Which text is most formal?
Informal writing is typically used in casual situations or when communicating with someone you know well. Informal language often expresses familiarity and tends to sound more like speech. It uses more conversational language, such as slang, idioms, abbreviations, imprecise language, and contractions. Formal writing is typically used in academic and business writing or when writing directly to an authority figure. It tends to be more courteous and impersonal, avoiding overly familiar or conversational language. Compare the following sentences. Informal: Yeah, ostriches can't fly, but I think they're awesome. More formal: Ostriches may be flightless, but they're remarkable runners. Most formal: Though flightless, ostriches are remarkable runners.
The second professional objective on a résumé is more formal. It uses more elevated language (I seek a position, opportunities for travel and advancement). The other professional objective uses casual language (want a job, a lot) and sounds more conversational.
What information supports the conclusion that Riley inherited this trait?
[ "Riley and her mother both wear their hair in braids.", "Riley's parents have red hair. They passed down this trait to Riley." ]
1
Read the description of a trait. Riley has red hair.
closed choice
grade3
natural science
biology
Heredity
Inherited and acquired traits: use evidence to support a statement
Organisms, including people, have both inherited and acquired traits. Inherited and acquired traits are gained in different ways. Inherited traits are passed down through families. Children gain these traits from their parents. Inherited traits do not need to be learned. Acquired traits are gained during a person's life. Some acquired traits, such as riding a bicycle, are gained by learning. Other acquired traits, such as scars, are caused by the environment.
Based on this information, what is Squeaky's phenotype for the albinism trait?
[ "having albinism", "not having albinism" ]
1
This passage describes the albinism trait in rats: In a group of rats, some individuals have albinism and others do not. In this group, the gene for the albinism trait has two alleles. The allele for having albinism (a) is recessive to the allele for not having albinism (A). Squeaky is a rat from this group. Squeaky has the heterozygous genotype Aa for the albinism gene.
closed choice
grade8
natural science
biology
Genes to traits
Genetics vocabulary: dominant and recessive
All organisms have pieces of hereditary material called genes, which are passed from parents to offspring. Genes contain instructions for building the parts of an organism. An organism's genes affect its observable traits, including its appearance, its behavior, and which diseases it may have. Genes may have different alleles, or forms, that can cause different versions of a trait. For example, flower color is a trait in pea plants. The gene for this trait has two possible alleles. Each allele is represented by an uppercase or lowercase letter. The allele F is for purple flowers, and the allele f is for white flowers. Each pea plant has two alleles for the flower color gene—one allele inherited from each parent. An organism's genotype for a gene is its combination of alleles for that gene. So, a pea plant may have a genotype of FF, Ff, or ff for the flower color gene. An organism's phenotype for a trait is its observable version of that trait, which depends on the organism's combination of alleles. A pea plant may have a phenotype of purple flowers or white flowers for the flower color trait. Some traits, like flower color in pea plants, are controlled by a single gene. Most plants and animals have a genotype made up of two alleles for these traits. These two alleles determine whether an organism is homozygous or heterozygous for the gene. An organism with two identical alleles for a gene is homozygous for that gene. A pea plant with the genotype FF or ff is homozygous for the flower color gene. An organism with two different alleles for a gene is heterozygous for that gene. A pea plant with the genotype Ff is heterozygous for the flower color gene. The types of alleles in an organism's genotype determine the organism's phenotype. Some alleles have types called dominant and recessive. These two types can cause different versions of a trait to appear as the organism's phenotype. A dominant allele causes its version of the trait to appear even when the organism also has a recessive allele for the gene. In pea plants, the F allele, which causes purple flowers, is dominant over the f allele. A pea plant with at least one F allele will have the F allele's version of the flower color trait. So, a plant with the genotype FF or Ff will have purple flowers. A recessive allele causes its version of the trait to appear only when the organism does not have any dominant alleles for the gene. In pea plants, the f allele, which causes white flowers, is recessive to the F allele. A pea plant with only f alleles will have the f allele's version of the flower color trait. So, a plant with the genotype ff will have white flowers.
You need to determine Squeaky's phenotype for the albinism trait. First, consider the alleles in Squeaky's genotype for the albinism gene. Then, decide whether these alleles are dominant or recessive. The allele for having albinism (a) is recessive to the allele for not having albinism (A). This means A is a dominant allele, and a is a recessive allele. Squeaky's genotype of Aa has one dominant allele and one recessive allele. An organism with at least one dominant allele for a gene will have the dominant allele's version of the trait. So, Squeaky's phenotype for the albinism trait must be not having albinism.
What is the mass of an elephant?
[ "6,690 grams", "6,690 kilograms" ]
1
Select the better estimate.
closed choice
grade5
natural science
units-and-measurement
Units and measurement
Choose metric units of mass
Measurements are written with both a number and a unit. The unit comes after the number. The unit shows what the number means. Mass is a measurement of how much matter something contains. There are many different units of mass. When you are using metric units, mass may be written with units of grams or kilograms. There are 1,000 grams in 1 kilogram. So, 1 gram is much less than 1 kilogram. A paper clip has a mass of about 1 gram, while a textbook has a mass of about 1 kilogram.
The better estimate for the mass of an elephant is 6,690 kilograms. 6,690 grams is too light.
Which figure of speech is used in this text? Dr. Patterson is unhappy with her new assistant because simple tasks, like fetching coffee, take him years to finish.
[ "euphemism", "hyperbole" ]
1
closed choice
grade12
language science
figurative-language
Literary devices
Classify the figure of speech: euphemism, hyperbole, oxymoron, paradox
Figures of speech are words or phrases that use language in a nonliteral or unusual way. They can make writing more expressive. A euphemism is a polite or indirect expression that is used to de-emphasize an unpleasant topic. The head of Human Resources would never refer to firing people, only to laying them off. Hyperbole is an obvious exaggeration that is not meant to be taken literally. I ate so much that I think I might explode! An oxymoron is a joining of two seemingly contradictory terms. Some reviewers are calling this book a new classic. A paradox is a statement that might at first appear to be contradictory, but that may in fact contain some truth. Always expect the unexpected.
The text uses hyperbole, an obvious exaggeration that is not meant to be taken literally. Take him years to finish is an exaggeration, since it probably does not take him entire years to fetch coffee.
What does the allusion in this text suggest? When Pam claimed she had loaded the dishwasher before turning on Dancing with the Stars, her mother replied, "Your nose is growing!"
[ "Pam was lying.", "Pam was trustworthy." ]
0
closed choice
grade6
language science
figurative-language
Literary devices
Interpret figures of speech
Figures of speech are words or phrases that use language in a nonliteral or unusual way. They can make writing more expressive. An allusion is a brief reference to something or someone well known, often from history or literature. "I'd better get home before I turn into a pumpkin!" Lila remarked.
The text uses an allusion, a brief reference to someone or something well known. The allusion nose is growing suggests that Pam was lying. In the story of Pinocchio, when Pinocchio lies, his nose grows longer.
Select the animal.
[ "Lynx eat animals.", "Walnut trees have many green leaves." ]
0
closed choice
grade2
natural science
biology
Classification
Identify plants and animals
Plants and animals are living things. Living things are called organisms. Plants come in many shapes and sizes. Most plants grow in the ground. They might grow leaves, flowers, and fruit. Plants cannot move around on their own like animals can. Animals also come in many shapes and sizes. Most animals can move around. Animals might run, swim, jump, or fly. Animals eat plants or other organisms for food.
A walnut tree is a plant. It has many green leaves. People pick and eat walnuts from walnut trees. Walnuts are the tree's seeds! A lynx is an animal. It eats animals. Lynx have padded feet to help them walk on snow.
Does this passage describe the weather or the climate? Where Jack lives, winter is the rainiest season of the year.
[ "weather", "climate" ]
1
closed choice
grade5
natural science
earth-science
Weather and climate
What's the difference between weather and climate?
The atmosphere is the layer of air that surrounds Earth. Both weather and climate tell you about the atmosphere. Weather is what the atmosphere is like at a certain place and time. Weather can change quickly. For example, the temperature outside your house might get higher throughout the day. Climate is the pattern of weather in a certain place. For example, summer temperatures in New York are usually higher than winter temperatures.
Read the text carefully. Where Jack lives, winter is the rainiest season of the year. This passage tells you about the usual precipitation where Jack lives. It does not describe what the weather is like on a particular day. So, this passage describes the climate.
Complete the statement. During this chemical reaction, the car engine becomes ().
[ "colder", "warmer" ]
1
When a chemical reaction absorbs or releases thermal energy, the reaction causes a change in temperature. Read the passage about a chemical reaction that absorbs or releases thermal energy. Then, follow the instructions below. The gasoline used in cars today is a mixture of over 1,000 different substances. One of these substances is isooctane (C8H18). In a car engine, isooctane reacts with oxygen (O2) to produce carbon dioxide (CO2) and water (H2O). During the reaction, a large amount of thermal energy is released into the surroundings. This thermal energy is used to power the car.
closed choice
grade6
natural science
chemistry
Chemical reactions
Describe energy changes in chemical reactions
During a chemical reaction, thermal energy is absorbed or released as heat. This transfer of thermal energy changes the temperature of the reaction's surroundings. The surroundings are everything around the reaction, such as the solution that the reaction takes place in or the air nearby. Some reactions release thermal energy into the surroundings. This thermal energy is converted from chemical energy, which is provided by the molecules in the reaction. As the thermal energy moves out of the reaction and into the surroundings, the temperature of the surroundings increases. Some reactions absorb thermal energy from the surroundings. This thermal energy is converted into chemical energy during the reaction. As the thermal energy moves out of the surroundings and into the reaction, the temperature of the surroundings decreases.
To determine whether the car engine becomes warmer or colder, look for the text that describes the movement of thermal energy during the reaction.The gasoline used in cars today is a mixture of over 1,000 different substances. One of these substances is isooctane (C8 H18). In a car engine, isooctane reacts with oxygen (O2) to produce carbon dioxide (CO2) and water (H2 O). During the reaction, a large amount of thermal energy is released into the surroundings. This thermal energy is used to power the car.The underlined text tells you that thermal energy is released into the surroundings. Because thermal energy moves out of the reaction and into the surroundings, the temperature of the surroundings increases.The surroundings include the car engine that the reaction takes place in. So, the car engine becomes warmer.
Complete the sentence. In an election, people choose their representatives and leaders by ().
[ "passing laws", "voting", "giving speeches", "drawing names randomly" ]
1
closed choice
grade3
social science
civics
Government
Presidential elections
In an election, people choose representatives and leaders by voting. When people vote, they officially make their choice in an important decision. Each person's choice is called a vote. Votes are counted up to decide who wins the election. In the United States, people use elections to choose many of the country's most important leaders. For example, Americans vote to choose the president of the United States every four years.
Which is a compound sentence?
[ "Coffee beans are the seeds of the coffee plant.", "The airport is closed, so we will have to take the train." ]
1
closed choice
grade3
language science
grammar
Sentences, fragments, and run-ons
Is the sentence simple or compound?
A simple sentence is a sentence with only one subject and predicate. The pitcher threw the ball to first base. A compound sentence is two simple sentences joined by a comma and a conjunction such as and, but, or, or so. The pitcher threw the ball, and the batter hit it. Some simple sentences have a compound subject or a compound predicate, but they are not compound sentences. Anna and James will watch the fireworks tonight. This simple sentence has a compound subject, Anna and James. The singers bowed and walked off the stage. This simple sentence has a compound predicate, bowed and walked off the stage. Some simple sentences have introductory phrases, but they are not compound sentences. The introductory phrase is part of the predicate. In the winter, Farmer Ben wears his heavy coat. This is a simple sentence. There is one subject, Farmer Ben, and one predicate, wears his heavy coat in the winter.
The second sentence is the compound sentence. It is made up of two simple sentences joined by a comma and the conjunction so. The airport is closed, so we will have to take the train.
What is the source of the allusion in the sentence below? Despite having won multiple teaching awards over the course of his career, the professor was best known for his stentorian voice.
[ "the Bible", "Greek mythology" ]
1
closed choice
grade12
language science
figurative-language
Literary devices
Recall the source of an allusion
An allusion is a brief mention of something or someone well known, often from mythology, history, or literature. An allusion lets you reference ideas from an entire story in just a few words. The protean nature of the disease makes it difficult to diagnose. The word protean is an allusion to the sea god Proteus in Greek mythology. Because the sea is constantly changing, to describe something as protean suggests that it is variable or in flux.
The source of the allusion stentorian is Greek mythology. In Greek mythology, Stentor was a herald who could shout as loudly as fifty men. The allusion stentorian means resounding.
What kind of sentence is this? Do you usually prefer your orange juice with pulp or without pulp?
[ "interrogative", "declarative", "imperative" ]
0
closed choice
grade7
language science
punctuation
Sentences, fragments, and run-ons
Is the sentence declarative, interrogative, imperative, or exclamatory?
There are four kinds of sentences. A declarative sentence is a statement, and it always ends with a period. The nurse told Mr. Abrams to roll up his sleeve so that she could check his blood pressure. An interrogative sentence is a question, and it always ends with a question mark. Do you have any plans for the upcoming weekend? An imperative sentence is a command. It makes a request or tells someone to do something, and it usually ends with a period. If the command shows strong feeling, it ends with an exclamation point. For this assignment, use references to support your claims. Don't drive so quickly in the construction zone! An exclamatory sentence is like a statement, but it shows surprise or strong feeling. An exclamatory sentence always ends with an exclamation point. I can't wait to travel through Europe this summer!
The sentence asks something, and it ends with a question mark. It is an interrogative sentence.
Complete the sentence so that it uses personification. The broken-down car () oil onto the concrete driveway.
[ "bled", "leaked" ]
0
closed choice
grade10
language science
writing-strategies
Creative techniques
Use personification
Personification is giving human characteristics to nonhuman things. It is a figure of speech that can be used to make writing more interesting or to emphasize a point. The trees danced in the wind. The word danced describes the trees as if they were people. Unlike people, however, trees can't actually dance. Instead, the personification suggests that the trees are moving.
Complete the sentence with the word bled. It describes the broken-down car as if it were a person who was bleeding.
Would you find the word velvet on a dictionary page with the following guide words? vanish - victory
[ "yes", "no" ]
0
yes or no
grade2
language science
reference-skills
Reference skills
Use guide words
Guide words appear on each page of a dictionary. They tell you the first word and last word on the page. The other words on the page come between the guide words in alphabetical order. To put words in alphabetical order, put them in order by their first letters. If the first letters are the same, look at the second letters. If the second letters are the same, look at the third letters, and so on.
Put the words in alphabetical order. Since velvet is between the guide words vanish - victory, it would be found on that page.
Which figure of speech is used in this text? When Ashley first joined the track team, she was afraid of jumping, but she got over that hurdle.
[ "pun", "verbal irony" ]
0
closed choice
grade6
language science
figurative-language
Literary devices
Classify figures of speech
Figures of speech are words or phrases that use language in a nonliteral or unusual way. They can make writing more expressive. Alliteration is the repetition of sounds at the beginning of nearby words. What a lucky little lady you are! An allusion is a brief reference to something or someone well known, often from history or literature. "I'd better get home before I turn into a pumpkin!" Lila remarked. An idiom is an expression that cannot be understood literally. Its meaning must be learned. The assignment was a piece of cake. A simile uses like or as to compare two things that are not actually alike. The cat's fur was as dark as the night. A metaphor compares two things that are not actually alike without using like or as. The snow formed a blanket over the town. Onomatopoeia involves using a word that expresses a sound. The scrambled eggs hit the floor with a splat. Personification is giving human characteristics to nonhuman things. The trees danced in the wind. A pun involves using a word or phrase in a humorous way that suggests more than one meaning. A great new broom is sweeping the nation. Verbal irony involves saying one thing but implying something very different. People often use verbal irony when they are being sarcastic. Olivia seems thrilled that her car keeps breaking down. Each breakdown is as enjoyable as a punch to the face.
The text uses a pun, a word or phrase that humorously suggests more than one meaning. Hurdle refers to an obstacle that one must overcome. It also refers to an object that a runner jumps over.
Complete the sentence. Filtering air to remove dust and pollen is a ().
[ "chemical change", "physical change" ]
1
closed choice
grade5
natural science
chemistry
Physical and chemical change
Compare physical and chemical changes
Matter is made of very small particles called atoms. Atoms can be linked together by chemical bonds. When two or more atoms link together, they form a molecule. In a chemical change, the chemical bonds in the molecules break. The atoms then link together to form new molecules. The types of molecules in matter before and after a chemical change are always different. Burning a piece of paper is a chemical change. As paper burns, paper molecules react with oxygen molecules in the air. This reaction breaks the chemical bonds in the molecules. The atoms then relink and form different molecules. For example, carbon dioxide molecules are created when paper burns. In a physical change, chemical bonds do not break. The types of molecules in matter before and after a physical change are always the same. A change of state is a type of physical change. For example, water vaporizing is a physical change. Liquid water and water vapor are made of the same type of matter: water.
Filtering air to remove dust and pollen is a physical change. The air flows through the filter, and the pollen and dust stay behind. This separates the mixture of air, pollen, and dust. But separating a mixture does not form a different type of matter.
Using only these supplies, which question can Mariana investigate with an experiment?
[ "Do sunflowers grow taller if they are planted in planter boxes or in pots?", "Do sunflowers grow bigger in sunny planter boxes or in shady planter boxes?", "Which type of sunflower grows more leaves?" ]
1
Mariana wants to grow sunflowers in her backyard garden. She notices that some sunflowers grow much taller than others. She is curious about what factors affect how sunflowers grow. So, she decides to design an experiment. She has the following supplies available: seeds from one type of sunflower soil one wooden planter box in the sun one wooden planter box in the shade one plastic planter box in the sun water
closed choice
grade8
natural science
science-and-engineering-practices
Designing experiments
Identify questions that can be investigated with a set of materials
Experiments can be designed to answer specific questions. When designing an experiment, you must identify the supplies that are necessary to answer your question. In order to do this, you need to figure out what will be tested and what will be measured during the experiment. Imagine that you are wondering if plants grow to different heights when planted in different types of soil. How might you decide what supplies are necessary to conduct this experiment? First, you need to identify the part of the experiment that will be tested, which is the independent variable. This is usually the part of the experiment that is different or changed. In this case, you would like to know how plants grow in different types of soil. So, you must have different types of soil available. Next, you need to identify the part of the experiment that will be measured or observed, which is the dependent variable. In this experiment, you would like to know if some plants grow taller than others. So, you must be able to compare the plants' heights. To do this, you can observe which plants are taller by looking at them, or you can measure their exact heights with a meterstick. So, if you have different types of soil and can observe or measure the heights of your plants, then you have the supplies you need to investigate your question with an experiment!
Which correctly shows the title of a song?
[ "\"Eight Days a Week\"", "\"eight Days a Week\"" ]
0
closed choice
grade4
language science
capitalization
Formatting
Capitalizing titles
In a title, capitalize the first word, the last word, and every important word in between. The Wind in the Willows James and the Giant Peach These words are not important in titles: Articles, a, an, the Short prepositions, such as at, by, for, in, of, on, to, up Coordinating conjunctions, such as and, but, or
Capitalize the first word, the last word, and every important word in between. The word a is not important, so it should not be capitalized. The correct title is "Eight Days a Week."
Select the invertebrate.
[ "clownfish", "fireworm", "macaw", "common snapping turtle" ]
1
Hint: Insects, spiders, and worms are invertebrates.
closed choice
grade5
natural science
biology
Classification
Identify vertebrates and invertebrates
Vertebrates and invertebrates are both groups of animals. A vertebrate has a backbone. The backbone is made of many bones in an animal's back. A vertebrate's backbone helps connect the different parts of its body. In the drawings below, each vertebrate's backbone is colored orange. An invertebrate does not have a backbone. In fact, invertebrates do not have any bones! Some invertebrates have an outer cover on their body called an exoskeleton. Other invertebrates have a soft body.
A macaw is a bird. Like other birds, a macaw is a vertebrate. It has a backbone. A clownfish is a fish. Like other fish, a clownfish is a vertebrate. It has a backbone. A fireworm is a worm. Like other worms, a fireworm is an invertebrate. It does not have a backbone. It has a soft body. A common snapping turtle is a reptile. Like other reptiles, a common snapping turtle is a vertebrate. It has a backbone.
Which logical fallacy is used in the text? How could I possibly have time to wash the dishes when so much carbon dioxide is being spewed into the atmosphere on a daily basis?
[ "red herring: the use of a completely unrelated topic or idea", "false dichotomy: an argument that presents only two choices when more options exist" ]
0
closed choice
grade8
language science
writing-strategies
Developing and supporting arguments
Classify logical fallacies
A strong argument uses valid reasoning and logic in support of a claim. When an argument or claim introduces irrelevant information or misrepresents the issues at hand, it may be committing a logical fallacy. Logical fallacies can hurt a writer's credibility and can lead readers to draw false conclusions. A logical fallacy may present irrelevant information: Fallacy | Description ad hominem | a personal attack meant to discredit one's opponent appeal to nature | an argument that assumes the natural choice is always the best choice bandwagon fallacy | an argument that assumes the popular choice is always the best choice circular reasoning | an argument that supports a claim with the claim itself guilt by association | an unfair negative association with another person or group that is intended to discredit someone or something red herring | the use of a completely unrelated topic in support of a claim A logical fallacy may misrepresent the issues at hand: Fallacy | Description false causation | the assumption that because two things happened together, one caused the other false dichotomy | an argument that presents only two choices when more options exist hasty generalization | a very broad claim based on very little evidence straw man | a misrepresentation of an opponent's position that makes it easier to argue against
The text argues that carbon dioxide entering the atmosphere somehow prevents the speaker from washing the dishes. However, these two ideas aren't related. This illustrates a type of logical fallacy known as a red herring.