What is common between Earthworm and Cockroach

Options

A. Nephridia
B. Solid ventral nerve cod
C. Closed circulation
D. Malphigian tubule

Explanation

To determine what is common between Earthworm and Cockroach, we can analyze their anatomical and physiological features step by step.

### Step-by-Step Solution:

1. **Identify the Organisms**:
- Earthworm (Annelida)
- Cockroach (Arthropoda)

2. **Excretory Structures**:
- Earthworm has nephridia for excretion.
- Cockroach has Malpighian tubules for excretion.
- **Conclusion**: Nephridia and Malpighian tubules are not common features.

3. **Nervous System**:
- Both Earthworm and Cockroach have a solid ventral nerve cord.
- This solid ventral nerve cord is a part of their central nervous system.
- **Conclusion**: The solid ventral nerve cord is a common feature.

4. **Circulatory System**:
- Earthworm has a closed circulatory system.
- Cockroach has an open circulatory system.
- **Conclusion**: Closed and open circulatory systems are not common features.

5. **Excretory Structures Again**:
- Malpighian tubules are specific to cockroaches and not found in earthworms.
- **Conclusion**: This is not a common feature.

6. **Final Conclusion**:
- The only common feature identified between Earthworm and Cockroach is the presence of a solid ventral nerve cord.

### Final Answer:
The common feature between Earthworm and Cockroach is the presence of a solid ventral nerve cord.

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