Setae of earthworm helps in locomotion. Discuss.

Explanation

### Step-by-Step Solution:

1. **Understanding Earthworm Anatomy**: Earthworms belong to the Phylum Annelida, which means they have a segmented body structure. Each segment of the earthworm's body is equipped with bristles known as setae.

2. **Role of Setae**: Setae are tiny, hair-like structures that protrude from each segment of the earthworm. These structures play a crucial role in locomotion by providing grip and traction as the earthworm moves through the soil.

3. **Mechanism of Movement**: The movement of an earthworm involves the contraction and relaxation of its muscles. As the earthworm contracts its muscles, it elongates and shortens its body, allowing it to push against the soil. The setae anchor the body in place, preventing it from slipping backward.

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