Clown fish shows commensalism/protocooperation with sea anemones .

Explanation

**Step-by-Step Solution:**

1. **Understanding the Interaction Types**:
- First, we need to understand the types of interactions that can occur between species. The two relevant types in this context are commensalism and protocooperation.

2. **Defining Commensalism**:
- Commensalism is a type of interaction where one species benefits while the other is neither helped nor harmed. In this case, the clownfish benefits from the sea anemone without affecting it.

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