When a piece of skin, muscle, bone, nails, or hair gets removed or damaged, those usually grow back like nothing happened. So, why isn’t it possible for hands, or even something smaller like a finger to regrow? Or would a piece of meat just regrow there instead of something useful?
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I would imagine that on an evolutionary time scale, humans haven’t been able to as reliably survive a lost limb without serious medical intervention. There would be no trait to pass if it were 100% death to lose an arm.
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