Are fish thirsty?

Fish are constantly surrounded by water, but are they thirsty? And how would they drink?

To answer these questions, it is crucial to understand how water, a solvent, interacts with other substances such as salt, which is a solute, across a cell membrane. Through a process called osmosis, water flows across a membrane from areas with low solute concentrations to areas with high solute concentrations until the cell can reach some sort of equilibrium with its external environment.

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