Common feature between cockroach and earthworm is:

Options

A. Hermaphroditism
B. Moulting of cuticle
C. Excretion by nephridia
D. Ventral nerve cord

Answer

To find the common feature between cockroaches and earthworms, we can analyze the characteristics of both organisms step by step.

### Step-by-Step Solution:

1. **Identify the Organisms**: We are comparing two organisms: the cockroach (an arthropod) and the earthworm (an annelid).

2. **Examine Key Features**:
- **Hermaphroditism**: This is a condition where an organism has both male and female reproductive organs. This feature is present in earthworms but not in cockroaches. Therefore, this cannot be the common feature.
- **Cuticle Molting**: Cockroaches undergo molting of their cuticles as part of their growth process. Earthworms do not exhibit this behavior, so this is also not a common feature.
- **Excretion Mechanism**: Earthworms excrete waste through structures called nephridia, while cockroaches have a different excretory system. Thus, this is not a common feature either.
- **Nervous System Structure**: Both cockroaches and earthworms possess a ventral nerve cord, which is a characteristic feature of many invertebrates. This structure is crucial for their nervous system function.

3. **Conclusion**: The common feature between cockroaches and earthworms is the presence of a **ventral nerve cord**.

### Final Answer:
The common feature between cockroach and earthworm is the **ventral nerve cord**.

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