Seriously, a bad sunburn could limit our ability to survive in the wild. I’ve had a few so bad I could barely move and I had a super high fever. Desn’t that happen to animals? How do they manage?
Simple answer, we don’t. Yes, skin cancer kills a lot of people. But on an evolutionary skill, it didn’t impact people’s reproductive success enough to favor the emergence a stronger form of biological sun protection than melanin. In theory the same goes for sunburn.
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