In earthworm following help in locomotion:-

Options

A. Chloragogen cells
B. Spermatheca
C. Clitellum
D. Setae

Answer

**Step-by-Step Solution:**

1. **Understanding Earthworm Anatomy**: The earthworm has a segmented body structure, which is crucial for its movement. Each segment contains muscles that can contract and relax.

2. **Role of Setae**: Setae are tiny bristle-like structures found on each segment of the earthworm's body. They help in anchoring the worm to the ground during locomotion.

3. **Locomotion Mechanism**: The earthworm moves by a process called peristalsis, which involves the contraction and relaxation of muscles in its segments. The setae help grip the soil, allowing the worm to push against it.

4. **Conclusion**: The main structure that aids in locomotion in earthworms is the setae, which provide anchorage and help in movement.

**Final Answer**: Setae help in locomotion in earthworms.

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