The organisms ignore each other. The organisms cooperate with each other. The organisms prey on each other. The organisms compete with each other.
I gave my students this multiple choice question: What is true of mutualistic relationships among organisms?

Only one answer is correct among these 4 choices:
- The organisms ignore each other.
- The organisms cooperate with each other.
- The organisms prey on each other.
- The organisms compete with each other.

Could you tell me which one is correct?

The organisms cooperate with each other.