Why can’t saltwater fish live in freshwater, and freshwater fish can’t live in saltwater?
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Freshwater fish will get their water sucked out of them into the salty ocean, scaly fish in the ocean have them to protect from their water being sucked out. Other marine animals without scales like octopi or squid fight this by filling their blood with urea, resulting in a isotonic relationship so water doesn’t try to flow from low concentration of solutes to high concentration
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