The mechanism for excreting nitrogenous waste in aquatic animals was ineffective on land because

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The excretion mechanism used by aquatic animals is primarily through diffusion of ammonia across their gills, which works well in an aquatic environment with more constant water availability. However, on land, animals have to deal with water conservation and balance issues, so they needed a more efficient system to excrete nitrogenous waste, such as urea, which requires less water to excrete.

The Mechanism for Excreting Nitrogenous Waste in Aquatic Animals Was