Question

A coral reef, shown below, is an underwater structure that is home to many sea animals that use the water as a resource. Some animals are called stony corals because they have hard bodies that resemble rocks. Stony corals provide protection to other animals that live on the reef.

A coral reef. A school of orange fish, a starfish, coral, plants, rocks, and water are shown.

Which is the largest organizational level found in one coral reef?
organism
population
ecosystem
biome

Answer 1

ecosystem

A coral reef includes many interacting organisms (populations and communities) plus the nonliving environment (water, rocks, light), so it is best described as an ecosystem.