animals. rocks and water. living and nonliving things. populations of plants and animals.
I gave my students this multiple choice question: An ocean, a forest, and a grassy meadow are each examples of a complete ecosystem. Complete ecosystems contain only

Only one answer is correct among these 4 choices:
- animals.
- rocks and water.
- living and nonliving things.
- populations of plants and animals.

Could you tell me which one is correct?

living and nonliving things.