One of the most extensive animal radiations is that of terrestrial arthropods (i

Question

One of the most extensive animal radiations is that of terrestrial arthropods (includes insects). They excrete uric acid as their form of nitrogenous waste. Why does this allow them to conserve more water than a mammal with extensive kidney tubules for water reabsorption?

a. After precipitation, uric acid no longer influences osmolarity, so water returns to the hypertonic tissues.

b. The high solubility of uric acid allows the excretory system to reabsorb water.

c. The uric acid levels stay high in the blood, maintaining a strong osmotic gradient, which allows water to be reabsorbed.

Explanation / Answer

One of the most extensive animal radiations is that of terrestrial arthropods (i

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