Given the likelihood in nature of being attacked and wounded, how come they never came to have more hardened skin to prevent being penetrated so easily?
In: 48
many animals DO have hard skin (reptile scales)…and even armored exoskeletons (insects/Arthropods/Crusteceans).
‘Animal’ is a *very* broad term and I’m guessing you meant is why do most *mammals* have soft skin, which is likely to do with the fact mammals bodies can sustain their own inside temperatures and were warm blooded?
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