eli5 : how did different animals come from common ancestors
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Imagine you have a brother. Your brother is taken to Mars on a spaceship, whilst you stay here on earth. Fast forward ten thousand years. Your descendants , on earth, will most likely differ in significant ways from the descendants of your brother on Mars , due to the different environments. So if you took an earthlingand a Martian, in ten thousand years time, you could say they had a common ancestor, ie your parents
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