Which of the following animals does not undergo metamorphosis

Options

A. Earthworm
B. Tunicate
C. Moth
D. Starfish

Answer

To determine which of the following animals does not undergo metamorphosis, we need to understand what metamorphosis is and analyze the options provided.

### Step-by-Step Solution:

1. **Define Metamorphosis**:
- Metamorphosis is a biological process where an organism undergoes a significant change in form or structure from its immature stage to its adult stage. This often involves distinct stages, such as egg, larva, and adult.

2. **Identify the Options**:
- The question likely provides multiple animals as options. For our analysis, we will consider common examples such as earthworm, butterfly, starfish, and tunicates.

3. **Analyze Each Animal**:
- **Earthworm**: Earthworms do not undergo metamorphosis. They hatch from eggs and grow into adults without any larval stage. Their structure remains relatively the same throughout their development.
- **Butterfly**: Butterflies undergo complete metamorphosis, which includes distinct stages: egg, larva (caterpillar), pupa (chrysalis), and adult.
- **Starfish**: Starfish also undergo metamorphosis, starting from a larval form before developing into the adult form.
- **Tunicates**: Tunicates undergo metamorphosis as well, transitioning from a larval stage to an adult form.

4. **Conclusion**:
- Based on the analysis, the only animal listed that does not undergo metamorphosis is the **earthworm**.

### Final Answer:
The animal that does not undergo metamorphosis is the **earthworm**.

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