A community is a very large ecosystem. An ecosystem is a very large community. An ecosystem includes a community and abiotic factors. A community includes an ecosystem and abiotic factors.
I gave my students this multiple choice question: What is the relationship between an ecosystem and a community?

Only one answer is correct among these 4 choices:
- A community is a very large ecosystem.
- An ecosystem is a very large community.
- An ecosystem includes a community and abiotic factors.
- A community includes an ecosystem and abiotic factors.

Could you tell me which one is correct?

An ecosystem includes a community and abiotic factors.