Which term refers to groups of ecosystems with similar abiotic conditions and communities?

The term "biomes" refers to large geographic areas characterized by specific abiotic conditions—such as climate, soil, and geography—and the living organisms found within those environments. Each biome features distinctive ecological communities that have adapted to thrive in the particular conditions present. For example, a desert biome is marked by low rainfall and extreme temperatures, which shapes the types of flora and fauna that can survive there.

In contrast, "biotic zones" typically refer to regions defined by the types and interactions of organisms, rather than the physical environment. "Habitats" denote the specific environment in which a particular species lives, encompassing a much smaller scale than a biome. "Ecological regions" might describe areas based on ecological characteristics but do not specifically clarify the relationship between abiotic factors and ecological communities as clearly as the concept of biomes does.

Thus, the correct term that encapsulates groups of ecosystems sharing similar abiotic conditions and communities is "biomes."