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This extinction happened around 65 million years ago during the Cretaceous period. It is known as the extinction that killed the dinosaurs and the ammonites. The possible cause of this was a very big meteorite.

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This extinction happened around 200 million years ago during the Triassic-Jurassic period. Some phases were blamed for this extinction like an asteroids and basalt eruptions. Half of all species had died at that time.

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This extinction happened 248 million years ago during the Permian period. It was also known as the great dying because 96% of a species died out. That other 4% are ancestors of all life today. Causes of this may have been asteroids, flood basalt eruptions, drop levels in oxygen.

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This extinction happened during the Devonian period and was 359 million years ago. It is estimated that around 75% of all species died out. The shallow seas were affected the most and didn't return to normal. The blame for this was asteroids, climate change, and new plants.

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This extinction was 443  million years ago during the Ordovician period. It  was known  as the 3rd largest extinction. An ice age was blamed for this extinction and 85% of sea life like  trilobites, brachiopods and graptolites were wiped out.

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It's how genes and DNA have changed over time.

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This is also known as the theory of recapitulation which is the stages of evolution an organism goes through over time in their life.

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These organs on our body are not useful for anything and have no primary function.

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This is when different animals or species have similar bone structures but those structures aren't used the same.

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Is when certain genes in a population disappear or fade over time and other genes may stay for a long time.

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This is when you have the same species of an organism but either the male or the female may have different physical traits. These traits can either attract each other or may harm the species.

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Occurs when two species evolve independently of each other, keeping similar traits.

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When different species begin to share similar traits after a period of time.

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A type of evolution that splits up close ancestors and puts organisms on a separate path of evolution.

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This happens when one population of organisms migrates to another population and may take over that other population.

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Mutation is the changing of the structure in a gene that may change the next generation which could be good or bad.

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It is when organisms are better adapted to their environment and are able to thrive and survive better than other organisms.

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The V stands for Variation which means  Evolution requires that DNA sequences change over time.
The I stands for Inheritance which is genetic material is inherited vertically from parent to child.
The S stands for Selection which refers to natural selection and the aspect of biological evolution.
The T stands for Time which means that is requires a lot of time.