Which statement best defines a biome?

A biome is best defined as a large ecological area characterized by distinct plant and animal groups adapted to the environment's climate. This definition aligns perfectly with the notion that biomes are extensive regions that share similar conditions, such as temperature, precipitation, and geographical features. This consistent climate fosters specific ecosystems, supporting particular communities of organisms that thrive under these conditions.

Understanding that biomes encompass significant area helps to clarify their importance in ecological studies and environmental management. For instance, a forest biome includes various species of trees, plants, animals, and microorganisms that have adapted to the specific climatic conditions of forests, like temperate or tropical rainforests.

This contrasts with the other options. A small area with diverse ecosystems does not adequately capture the expansive nature of biomes. Urban areas with high population density focus more on human geography than ecological definitions. Lastly, while climate change can affect biomes, it does not define them; rather, it refers to shifts in climate patterns that impact existing biomes. By focusing on the interconnectedness of large ecological areas and their characteristic organisms, the definition aligns more accurately with the scientific understanding of biomes.