Question

Do fish that live in the sea need salt? What do they do if they take in too much of it from
seawater?
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Answer 1

As a result, most saltwater fish constantly lose water through their gills and skin. Because the fish is losing water, it must drink a lot to stay hydrated-but salty seawater is the only water around. To get rid of excess salt, the fish's kidneys pump lots of salt into its urine.

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