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Umm I think it might be because we don't need it. We are highly intelligent and that is enough of a defense against other animals. Also we don't have any "natural predators" and we were able to hunt without the use of claws, beaks or all of that stuff.
I mean when human discovered that making weapons like spears and arrows could be use to hunt. Why would we grow teeth and claws?
So I'd say our brain is our natural defense :)
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∙ 13y ago
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