Which is not an adaptation of desert animals that them retain and acquire water in such a hot and dry environment?

a. burrow in moist soil or live in underground dens
b. excrete uric acid instead of urine
c. evolved an internal "air conditioning" system to them stay cool
d. obtain water from the plants and animals they eat

The best and most correct answer among the choices provided by your question is the third option or letter C. Animals in the desert don't have an internal "air conditioning" system to help them stay cool. Mostly, they have these specific glands that will keep them hydrated under the extreme heat of the sun.
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Ribonuclease activity is a type of nuclease that catalyzes the degradation of rna into small components.