How much precipitation does a desert typically receive each year?

Deserts are defined by their low precipitation levels, which typically amount to 25 centimeters (10 inches) or less annually. This minimal precipitation significantly influences the ecosystem and climate of desert regions, leading to extreme temperatures and arid conditions. The limited moisture availability restricts plant and animal life, resulting in a unique adaptation of organisms to survive in such challenging environments.

In contrast, other options suggest higher annual precipitation levels than what is characteristic of deserts. For instance, regions that receive 50 cm, 75 cm, or more than 100 cm of rainfall would not fit the classification of a desert due to their ability to support a greater variety of flora and fauna due to sufficient moisture. Thus, the correct answer highlights the defining trait of deserts in relation to their annual precipitation.