“What is the evolutionary advantage for Homo sapiens becoming essentially hairless when compared to all other primates?”
Dr. Andrew Simons, a professor in the department of biology at Carleton University, says it depends on which hypothesis you believe.
The leading hypothesis, known as the “keep cool hypothesis,” happened 1.6 to 1.2 million years ago. Prior to that point, our human ancestors were eating seeds and a lot of other vegetation. Climate change was also occurring at that time, which forced our ancestors to dramatically change their lifestyle to become much more active. That’s when they started hunting and meat was introduced into their diet.
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Original Source: Quirks & Quarks, CBC Radio, Saturday November 25, 2017