Why can’t saltwater fish live in freshwater, and freshwater fish can’t live in saltwater?
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Saltwater fish have internal processes (see osmosis talked about above) that are constantly flushing excess salt out of their bodies. If they are in freshwater, the loss of salt in their bodies will quickly result in them dying, essentially, of dehydration. Reverse for freshwater fish if you put them in salt water.
Salt is one of substances that our bodies have to take special care to maintain the right balance of, because it is so essential to the chemical processes that keep our cells functional.
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