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Earthworm moves by the contraction and r...

Earthworm moves by the contraction and relaxation of___

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**Step-by-Step Solution:** 1. **Understanding Earthworm Anatomy**: Earthworms belong to the phylum Annelida and have a soft, elongated body structure without a skeleton. 2. **Identifying Movement Mechanism**: The movement of earthworms is facilitated by their unique body structure, which includes muscles. 3. **Muscle Functionality**: The muscles in earthworms perform two primary functions: contraction and relaxation. ...
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