Animals that excrete nitrogenous wastes as ammonia need lots of water
They release ammonia across the whole body surface or through gills
In some animals the liver converts ammonia to less toxic erea
The circulatory system carries the urea to the kidneys to be excreated
Insects, land snails, and many reptiles mainly excrete uric acid
Uric acid is largely insoluble in water and can be secreted as a paste with little water loss
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