Why can’t saltwater fish live in freshwater, and freshwater fish can’t live in saltwater?
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If you fill up a bag with salt water, tie it shut and then place it into a bowl of freshwater, the saltwater will leak through the bag into the fresh water. (some kind of weird physics called osmosis, that makes it so the salt wants to spread evenly and makes it so it’s, somehow, able to pass through the bag. Don’t ask me for further details on that.)
From my understanding, this is basically the same thing that’ll happen to salt water fish is placed into fresh water. The salt in their cells will kinda leak out. Since they’re made to have a certein salt content in their bodies, they will die if they don’t have that.
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