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Get the calendar now before it sells out.
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We also have bundles and special calendar deals with some of your favorite products.
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Thank you so much to all of the thousands of birbs who get the calendar every year.
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With every purchase you support the Kurzgesagt division of sparking curiosity and inspiring people all around the world.
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We wish you an epic year 12,024.
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What is evolution?
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Evolution is the development of life on Earth.
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This is a process that began billions of years ago and is still continuing to this day.
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Evolution tells us how it was possible for the enormous diversity of life to develop.
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It shows us how primitive protozoa could become the millions of different species that we see today.
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Evolution, then, is the answer to the question that we have all asked on seeing a Daxun and a Great Dane together.
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How is it possible for ancestors to have descendants that look so very different to them?
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In answering this question, we want to focus on animals, excluding other forms of life such as fungi and plants.
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The first question to ask is therefore, how can one animal develop into a whole new species of animal?
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What exactly is a species?
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A species is a community of animals that is capable of producing offspring with one another, with those offspring also being capable of reproducing in turn.
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To understand this answer better, we need to take a closer look at the following points.
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Let's begin with uniqueness.
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Every creature that exists is unique, and this is essential for evolution.
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The members of a species may strongly resemble each other in appearance, however, they all have slightly different traits and characteristics.
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They may be a bit bigger, fatter, stronger or bolder than their fellow animals.
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So, what is the reason for these differences?
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Let's take a closer look at a creature.
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Every creature is made up of cells.
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These cells have a nucleus.
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The nucleus contains the chromosomes, and the chromosomes hold the DNA.
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DNA consists of different genes, and it's these genes that are life's information carriers.
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They contain instructions and orders for the cells, and determine the characteristics and traits that living creatures have.
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And it's precisely this DNA that is unique to every creature.
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It's slightly different from individual to individual, which is why each has slightly different characteristics.
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But how is the enormous range of DNA created?
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One key factor is the excess production of offspring.
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In nature, we can observe that creatures generally produce far more offspring than is necessary for the survival of their species,
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Often, there are even more offspring than the environment in which they live is able to support.
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This is one factor in increasing diversity within a species.
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The more offspring that are produced, the more little differences occur.
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And this is what nature wants – as many little differences as possible.
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The second major cause of the uniqueness of individuals occurs in heredity itself.
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By the way, heredity means the passing on of DNA to offspring.
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Two very interesting factors come into play in this process – recombination and mutation.
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Recombination is the random mixing of the DNA of two creatures.
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When two creatures fall in love and mate, they recombine their genes twice.
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The gametes take half of the genes and shuffle them.
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The second recombination occurs when a male inseminates a female.
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The parents each provide 50% of their DNA, in other words, 50% of their unique traits and characteristics.
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These are then recombined or mixed, and the result is new offspring.
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These offspring have a random mix of the DNA and therefore the traits and characteristics of their parents.
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This increases the diversity and differences within a species even further.
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But mutations are also important for evolution.
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Mutations are random changes in DNA.
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These can also be described as copying errors within the DNA, triggered by toxins or other chemical substances or by radiation.
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A mutation exists when a part of the DNA is altered.
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These changes are often negative and may result in illnesses such as cancer.
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However, they may also have neutral or positive effects, such as the blue eye colour in humans, which is one such random mutation.
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In all cases, a mutation has to affect a gamete, that is, a sperm or egg cell.
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Because only the DNA in the gametes is passed on to the offspring.
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This is also the reason why we protect our sexual organs during X-rays, whilst other parts of the body are not at risk.
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In summary then, in the heredity process, creatures pass on their characteristics to their offspring in the form of DNA.
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Recombination and mutation change the DNA, so that each child looks different to its siblings and receives a random mix of the characteristics of its parents.
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There's a key word here.
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All of these processes are based on chance.
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Random recombination and mutations result in individuals with random mixes of traits and characteristics, which in turn mix these randomly and pass them on.
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But how can so much be down to chance when all living creatures are so perfectly adapted to their environment?
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The answer is provided by the second key point, selection.
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Each individual is subjected to a process of natural selection.
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As we have learned, each individual is somewhat different to its fellows, and there is extensive variation within a species.
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Environmental influences have an effect on living creatures.
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These so-called selection factors include predators, parasites, animals of the same species, toxins, changes in habitat or the climate.
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Selection is a process that each individual is subjected to.
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Every creature has a unique mix of traits and characteristics.
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This mix helps them to survive in their environment.
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Anyone with an unsuitable mix will be selected from the environment.
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Those with the right mix survive and can pass on their enhanced traits and characteristics.
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This is why diversity is so important.
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This is why creatures make so much effort to produce offspring that are as different as possible.
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They increase the likelihood that at least one of their offspring passes nature's selection process.
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They maximize their chances of survival.
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A good example of this can be seen in a group of finches living on a remote island.
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They are some of the most famous animals in the world of science and are known as Darwin finches, after their discoverer Charles Darwin.
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And this is the story of those finches.
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A few hundred years ago, a small group of finches was blown onto the Galapagos Islands in the middle of the Pacific, probably by a big storm.
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The finches found themselves in an environment that was completely new to them.
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They reproduced rapidly and numerously.
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The islands were soon heaving with finches.
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This meant that food supplies became increasingly scarce.
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The finch paradise was threatened with famine and finch friends became competitors.
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This is when selection intervened.
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Their individuality and small differences, in this case their slightly different beaks, meant that some of the birds were able to avoid competing with their fellow finches.
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The beaks of some of the finches were more suitable for digging for worms.
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Other finches were able to use their beaks better for cracking seeds.
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The finches consequently sought out ecological niches.
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In these niches, they were safe from excessive competition.
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They soon began to mate primarily with other finches that used the same niche.
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Over the course of many generations, these characteristics were enhanced, enabling the finches to exploit their niches successfully.
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The differences between the worm diggers and the seed crackers became so large that they were no longer able to mate with one another.
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Different species emerged as a result.
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Today there are 14 different species of finch living on the Galapagos Islands, all of which are descended from the same group of stranded finches.
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This is how new species are created by evolution.
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Why is this so important?
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It tells us where the variety of life comes from and why living creatures are so perfectly adapted to their habitats.
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