How did primitive humans cut/file their nails prior to the invention of metal tools?
by 
Old School
ANSWERS: 4
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They probably had no need to, just as animals in the wild have no need to. For a hunter-gatherer with no shoes. normal wear and tear would have kept them as short as could be wished.
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maybe they bit them off
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They probably had no need because they use them as tools themselves and naturally wore them down. But sand itself is abrasive and could be used for such. In fact they say walking on the beach is an excellent exfoliant for your feet.
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on rocks and stones
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mushroom Definitely. In the million or more years of our ancestors' existence, the main durable thing they had available was rocks. They became very adept at collecting, using, reusing and piling them up.
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pearllederman 
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