Which of the following would be the most important adaptation for a desert-dwelling animal to possess? a. heat dissipation structures b. heat conserving structures c. energy conserving behaviors d. water conserving behaviors

The correct answer is option d. water conserving behavior.

The desert biome lacks water, so, the conservation of the water is very important for the organism for the survival in the deserts. The desert dwelling animals are adapted, in such a way, that the water is conserved in the body of the animals. They do not drink water for many days and utilize the water present in the body.  

"d.) carbon dioxide and hydrogen sulfide"