Which statement best defines an apex predator?

• A. An apex predator sits at the top of a food chain with few or no natural predators and helps regulate prey populations. Example: African lion.
• B. A predator that specializes in plants.
• C. A species that is always the smallest in its ecosystem.
• D. An animal that migrates seasonally.

Answer: (A)

An apex predator is at the very top of the food chain, with few or no natural enemies, and its role helps keep prey populations in check to maintain balance in the ecosystem. That top position and regulatory effect are what define it, which is why describing an apex predator as sitting at the top and influencing prey numbers fits best. The African lion is a classic example of this role in its ecosystem.

The other descriptions don’t fit the idea. A predator that specializes in plants would be a herbivore, not a predator of animals. Being the smallest in an ecosystem isn’t relevant to trophic level or predatory status. Migrating seasonally describes movement, not a predator’s place in the food web.