Which term refers to the global sum of all ecosystems, including all life on Earth and their environments?

Which term refers to the global sum of all ecosystems, including all life on Earth and their environments?

• A. Biosphere
• B. Ecology
• C. Biome
• D. Habitat

Answer: (A)

The global sum of all ecosystems, including all life on Earth and their environments, is the biosphere. The biosphere encompasses every living organism and the environments they interact with—air, water, soil, and climate—across the planet, from the highest atmosphere to the deepest oceans. Ecology is the science that studies how these organisms interact with each other and their surroundings, not the global collection itself. A biome refers to large geographic regions with similar climate and communities, like deserts or rainforests, which is a regional classification rather than the entire Earth. A habitat is the specific place where an organism lives within a ecosystem, more localized in scope. So the biosphere best captures the idea of the global sum of all ecosystems and their environments.

The global sum of all ecosystems, including all life on Earth and their environments, is the biosphere. The biosphere encompasses every living organism and the environments they interact with—air, water, soil, and climate—across the planet, from the highest atmosphere to the deepest oceans. Ecology is the science that studies how these organisms interact with each other and their surroundings, not the global collection itself. A biome refers to large geographic regions with similar climate and communities, like deserts or rainforests, which is a regional classification rather than the entire Earth. A habitat is the specific place where an organism lives within a ecosystem, more localized in scope. So the biosphere best captures the idea of the global sum of all ecosystems and their environments.