The form in which nitrogen waste is removed from the body is dependent mostly on the organism's availability of water.

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The form of nitrogenous waste (ammonia, urea, or uric acid) excreted by an organism largely depends on its habitat and the availability of water. Aquatic animals tend to excrete ammonia directly into the water, whereas terrestrial animals convert nitrogenous wastes into less toxic forms like urea or uric acid, which require less water for excretion.

The Form in Which Nitrogen Waste Is Removed from the Body