What type of respiratory structures are present in earthworm?

Explanation

### Step-by-Step Solution:

1. **Understanding Respiration**:
- Respiration is the process of gas exchange, specifically the intake of oxygen and the release of carbon dioxide.

2. **Respiratory Structures in Earthworms**:
- In earthworms, respiration occurs through their general body surface, which acts as the primary respiratory structure.

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