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    Biology The Unity Study Set 1
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    Exam 25: Animal Evolution - the Chordates
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    Mammals Appeared 220 Million Years Ago but Did Not Begin
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Mammals Appeared 220 Million Years Ago but Did Not Begin

Question 41

Question 41

Essay

Mammals appeared 220 million years ago but did not begin to greatly diversify until 65 million years ago. Why is this?

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​During the first 155 million years of m...

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