When a scientist is conducting research about all the plants and wildlife in the mojave desert as well as the desert’s resources, such as water and soil, the scientist is studying
a. a community.
b. a population.
c. a species.
d. an ecosystem.

The correct answer is- D. an ecosystem.

An ecosystem can be described as system of biological community ( including all life forms such as plants and animals) that interact among themselves as well as with the non living components ( such as air, water , soil, temperature) present in their environment.

Thus, In the question, scientist who is conducting research about all the plants and wildlife in the Mojave Desert as well as the desert’s resources, such as water and soil, the scientist is studying an ecosystem.

Thus, option D) is the right answer.

The correct answer is d)ecosystem.

A ecosystem is community of both biotic(living) and abiotic (non-living) components such as air, water, and soil so if a scientist is conducting research on wildlife as well as on water and soil than he/she is studying a ecosystem.