The Aquatic Ape Theory
Why do humans differ from other primates? The aquatic ape theory suggests that early human ancestors lived in water at least part of the time. This aquatic lifestyle may account for our hairless bodies, which made us more streamlined for swimming and diving; our upright, two-legged walking, which made wading easier; and our layers of subcutaneous fat, which made us better insulated in water. The theory even links an aquatic existence to the evolution of human speech. More from Robert Sepehr, author and anthropologist.
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