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c. freshwater salmon

Because some marine bony fish, mammals, and sharks produce large amounts of urine...

Isn't it b? Since the marine environment is very dehydrating as it has a large amount of salts in it so the marine bony fish is hypo-osmotic compared to it's evironment. This means water will flow from the bony fish to the environment. If it were to produce a large amount of urine it would become more dehydrated which is deathly to all organisms. Therefore in order to conserve water the bony fish will drink large volumes of water and excrete very little, very concentrated urine.

P.S. It can't be sharks as they actually slowly gain water since the urea and the trimethylamine that they store make the shark hyper-osmotic to the environment so water slowly enters the shark

:) Hope this helps

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