Which feature and organs of the digestive system of earthworms are related to their diet?

Explanation

**Step-by-Step Solution:**

1. **Understanding Earthworm's Diet**:
- Earthworms primarily feed on decomposing organic material and small organisms found in the soil. This diet is crucial for their role in soil health and nutrient cycling.

2. **Identifying Digestive System Features**:
- The digestive system of earthworms has specific adaptations that align with their diet. Key features include:
- **Muscular Walls**: The digestive tract has muscular walls that help in the movement and processing of food.
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