Which term describes a defined geographic or vertical region within a marine ecosystem?

• A. Sublittoral
• B. Algae
• C. Zone
• D. Top Consumer

Answer: (C)

Think about how marine environments are divided into different areas to describe where things live and how conditions change with depth. A zone is the general term for any defined geographic or vertical region within an ecosystem. It’s the umbrella label that covers coastal, offshore, shallow, or deep areas as well as light-rich (photic) or dark (aphotic) layers.

Algae describes living organisms, not a region. A top consumer refers to organisms high in the food chain, not a spatial area. Sublittoral is a specific vertical region, but the question asks for the broad term that names any defined area, which is zone.