What is the scientific theory, evidence or ideas why bipedism evolved as a Hominidae trait?
by 
M Moon
ANSWERS: 2
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Its recently demonstrated that bipedism saves more energy than walking on four limbs.
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I saw a very interesting documentary once about a theory that we evolved when there was alot more water covering the earth so we had to wade around in water most of the time. We started walking on two legs to get our heads higher above the water. This theory also explains why a diet of fish is better for us. http://www.riverapes.com/Me/Work/Wading%20for%20NutritionAndHealth.htm
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