Skin is an interesting solution to the durability problem. Arthropods took the obvious route: have a durable outer surface. Fish scales split the balance by being durable but also shedding. Now skin and fur are pretty wild. Constant micro shedding. Not durable, but self-healing.
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To be fair: neither am I, although I do feel funny about the architectural routes that my body took which made ambidextrous writing possible. Those I would like to keep.
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