Which term refers to all life everywhere?

• A. Ecosystem
• B. Biosphere
• C. Organism
• D. Cells

Answer: (B)

The main idea tested here is the scope of life on Earth. The term that refers to all life everywhere is the biosphere. It encompasses every living organism—from microbes to plants and animals—and all the places they live, across oceans, soil, air, and land. It’s the global collection of ecosystems and the interactions among organisms and their environments, spanning the entire planet.

An ecosystem is a specific geographic area with particular communities and physical surroundings; it’s a smaller unit within the biosphere. An organism is a single living being. Cells are the basic units of life that make up organisms, but they don’t describe life across the whole planet.