some things aren’t designed to live in saltwater.
You as a human I’m assuming probably drink clean water and can’t effectively be hydrated by saltwater, if you just drank saltwater, you wouldn’t be hydrated properly because you’re not really designed to, the same kind of logic applies to different organisms. Some can effectively live in saltwater and others can’t. It all depends on how they adapted to their environment, some animals exist in both too.
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