Related Links
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Fossil Evidence
Examine five transitional species that fill so-called gaps in the fossil record.
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Creature Courtship
Why do males expend such time and energy to find a mate? Because of a little force of nature known as sexual selection.
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The Zoo of You
In this interactive, see how closely parts of your body match those in other animals, from sharks to fruit flies.
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Becoming Human Part 1
First Steps: Six million years ago, what set our ancestors on the path from ape to human?
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