Which one of the following features is common to Earthworm, Butterfly, Spider and Prawn ?.

Options

A. Setae
B. Antenae
C. Ventral nerve cord
D. Nephridia

Answer

To solve the question of which feature is common to Earthworm, Butterfly, Spider, and Prawn, we will analyze the options provided:

1. **Setae**:
- Setae are bristle-like structures found primarily in earthworms. They help in locomotion and are not present in butterflies, spiders, or prawns.
- **Conclusion**: Not common to all four.

2. **Antennae**:
- Antennae are sensory appendages found in insects (like butterflies) and crustaceans (like prawns). However, they are absent in earthworms and spiders.
- **Conclusion**: Not common to all four.

3. **Ventral Nerve Cord**:
- The ventral nerve cord is a characteristic feature of many invertebrates, including earthworms, butterflies, and spiders. It serves as a major nerve pathway in these organisms. Prawns, being crustaceans, also possess a ventral nerve cord.
- **Conclusion**: Common to all four.

4. **Nephridia**:
- Nephridia are excretory structures found in earthworms and some other invertebrates. However, they are not present in butterflies, spiders, or prawns.
- **Conclusion**: Not common to all four.

Based on the analysis of the options, the feature that is common to Earthworm, Butterfly, Spider, and Prawn is the **Ventral Nerve Cord**.

### Final Answer:
The common feature among Earthworm, Butterfly, Spider, and Prawn is **C. Ventral Nerve Cord**.

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