I now it's a dumb question but I was wondering, if they live in water, can they drink ?
actually technically, fish do sort of drink, they absord and breathe in the water, but they are only using the oxygen molecules, they pretty much spit out the water once they get the oxygen from it.and fish dont really pee, since they dont drink, any liquids would be part of their excrement. (more commonly referred to as "poop")
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This should pretty much cover it.
no they absorb it through there skin and gills