In some amniotes, which of the following is a waste product of nitrogen metabolism that is low enough in toxicity that it can be excreted as a semisolid paste, thus reducing water loss?

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Uric acid is a waste product of nitrogen metabolism in some amniotes, such as birds and reptiles, that is low in toxicity and can be excreted as a semisolid paste. This adaptation allows these animals to conserve water, which is particularly advantageous in arid environments.

In Some Amniotes, Which of the Following Is a Waste