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It just looks like hair; those are actually tentacles. Merfolk are not descended from fish or mammals, but are a type of Cnidarians, who use stingers in their tentacles to stun and kill prey.
Answer
It just looks like hair; those are actually tentacles. Merfolk are not descended from fish or mammals, but are a type of Cnidarians, who use stingers in their tentacles to stun and kill prey.