Adaptive melanism describes selection for
a.
mottled pigmentation
b.
lighter pigmentation
c.
darker pigmentation
d.
more colorful pigmentation

Adaptive melanism describes selection for darker pigmentation.

Explanation:

Hereditary changes in melanin production cause the darkening in color of populations of animals as a survival strategy that makes them less conspicuous to predators.

For example the rock pocket mouse has a sandy dorsal pelage and white underbelly, and it inhabits light-colored rocks. In other regions these mice are found on lava flows where they are typically melanic, with dark-colored dorsal hairs and white underbellies. This darker coloration provides protection from avian and mammalian predators.

explanation:

desert perennials often survive by remaining dormant during dry periods of the year, then springing to life when water becomes available. most annual desert plants germinate only after heavy seasonal rain, then complete their reproductive cycle very quickly.