And why do they grow?
In: Biology
In addition to the other answers, one very important purpose of nails for humans and the reason why they are flat (mostly flat) is that they provide a hard wall that the tip of our fingers press against when we touch something and that gives us a much more precise sense of touch. Without nails the flesh would deform when we, for instance, type on a keyboard and our sense of touch would not be as precise and accurate. .
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