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re: How do you explain the origin of the various human races scientifically?
Posted on 8/19/14 at 12:06 pm to RabidTiger
Posted on 8/19/14 at 12:06 pm to RabidTiger
quote:
I'll give you a hint: It involves the sun.
Right. So one theory is that people in different latitudes developed darker or lighter skin to take in or keep out excess vitamin D.
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