What would happen if a freshwater fish did not produce lots of watery urine

     The right answer to this question is: Water would come out of the fish by a process called osmosis.

Explanation:

     This could happen for a series of reasons, but the main one is that, fish produce a watery urine because, if they had the same urine as we, humans, have, their body wouldn't be adapted to it inside the water. A watery urine is highly soluble in water , and this helps the fish not to contaminate the water he lives in.

        Osmosis works in a way that will always balance both sides of the equation, and this would happen with water, their body would balance the quantity of water in and out of the body.

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