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Extinction is where no members of a species remain alive. It can be caused by; a new predator, new competion, new diseases or the animal is poorly adapted to an abrupt climate change. i.e, the mammoth and the end of the Ice Age. There are other factors such as a giant asteroid smashing in to earth or increasing volcanic activity, these normally cause mass-extinction i.e, the dinosaurs(or K.T extinction, because this caused the cretacous era to come to an end and start the tertiary era(and no I dont no why its a K))

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Q: What is extinction and what are its causes?
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