Which biome is defined by its dry climate and low rainfall?

The desert biome is characterized by its extremely dry climate and very low levels of rainfall, typically receiving less than 10 inches (25 cm) of rain per year. This biome features sparse vegetation, as the limited water availability restricts plant growth. The organisms that do inhabit deserts are specially adapted to survive in such arid conditions, employing strategies such as water conservation and drought resistance.

In contrast, the taiga biome, or boreal forest, consists of dense forests with much higher moisture levels and experiences distinct seasonal temperature variations. The savanna biome, while also characterized by certain dry seasonal conditions, receives more rainfall and has a mix of grasslands and scattered trees. The tundra biome is known for its cold temperatures and short growing seasons, but it can actually have moisture levels that allow for the presence of mosses and low-lying vegetation, rather than the extreme dryness typical of deserts. This distinct lack of moisture and adaptations to extreme aridity is what firmly defines the desert biome.