The major difference between marine and freshwater animals lies in the toxicity of body fluids. Marine animals have body fluids that are saltier than the surrounding seawater, while freshwater animals have body fluids that are less salty than the surrounding freshwater. This difference in salt concentration creates a significant physiological challenge for each organism, requiring them to develop specific mechanisms to regulate their internal salt and water balance (osmoregulation).
A major difference between marine and freshwater animal lies in ______?
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