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Author Topic: Why do humans walk on two legs? To save energy  (Read 275 times)

Offline Josetann

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Why do humans walk on two legs? To save energy
« on: July 23, 2007, 03:27:00 PM »
Chimps on treadmills may help explain why human ancestors evolved into bipeds 10 million years ago.
Images: Humans vs. chimps at the gym

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