Help me understand
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Sharks don’t have any body parts that can make noises. Whales and dolphins do.
This isn’t really a “fish vs. mammals” thing, though. There are fish like [croakers](https://en.wikipedia.org/wiki/Atlantic_croaker) that can make noises too!
So there’s not really an answer. Sharks never needed to be able to make noises, and if any evolved the capability it didn’t make them better at breeding, so it didn’t become a dominant trait of sharks. On the other hand, whales and dolphins form social groups crucial to their survival, and being able to make noises made them better at that. So the ones who could make noises had more babies thus it became a dominant trait!
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