The species compete with each other. One species preys on the other. The species ignore each other. One species benefits from the other.
I am hesitating between 4 options to answer the following question, which option should I choose?
Question: Two populations of reef fish live in biological coexistence with each other. Which sentence best describes their relationship?
Possibilities:
- The species compete with each other.
- One species preys on the other.
- The species ignore each other.
- One species benefits from the other.

The species ignore each other.