Give two examples of commensalism.

Explanation

To answer the question about commensalism, we will follow these steps:

### Step-by-Step Solution:

1. **Define Commensalism**:
Commensalism is a type of symbiotic relationship between two living organisms where one organism benefits while the other is neither helped nor harmed. In this interaction, the benefiting organism is referred to as the commensal.

2. **Identify Characteristics**:
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