Which term refers to a large region of the earth?

The term that refers to a large region of the Earth is "biome." A biome is characterized by its climate, vegetation, and animal life, and it encompasses various ecosystems that share similar environmental conditions. Examples of biomes include deserts, forests, grasslands, and tundras. Each biome has distinctive features and serves as a habitat for many species, illustrating the intricate connections between the living organisms and their environment on a grand scale.

In contrast, "habitat" denotes a specific area where an organism lives, which is smaller and more focused than a biome. "Dominion" typically refers to control or sovereignty over a territory and is not a scientific classification. "Landscape" usually describes a physical area that encompasses land forms, vegetation, and human influences but does not specify the ecological characteristics needed to define a biome.