Describe the osmotic regulation strategies of marine fish

Water will diffuse into the fish, so it excretes a very hypotonic (dilute) urine to expel all the excess water. A marine fish has an internal osmotic concentration lower than that of the surrounding seawater, so it tends to lose water and gain salt. It actively excretes salt out from the gills.

Explanation:

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answer: collecting information/data

reason: the student is going around and asking people questions to collect data

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sodium i think the chemical element of atomic number 11, a soft silver-white reactive metal of the alkali metal group.