How do animals that live in saltwater stay hydrated?
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Their insides are just ss salty as the water outside. We dehydrate because saltwater in our gut causes water to go from our cells into our gut, to balance the saltiness. Drinking saltwater gives us diarrhea that way, but a saltwater animal has saltier cells that are balanced with the salt content of the water. Putting them in freshwater does the opposite – too much water goes into their cells and they burst.
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