D. a viral disease because it is known and unknown and spreads.
Answer:The physiological response is to maintain a neutral PH.
Explanation:
This biome has a layer of soil that can either be sandy, gravelly, or stony, depending on the type of desert. Deserts usually get at most 50 centimeters (20 inches) of rainfall a year, and the organisms that live in deserts are adapted to this extremely dry climate. Plants in deserts have adaptations to conserve water.
