One of the following animal has no metamorphosis in its life cycle

Options

A. Pheretima
B. Asterias
C. Musca
D. Butterfly

Answer

To determine which of the following animals has no metamorphosis in its life cycle, we need to analyze the options provided and understand the concept of metamorphosis.

### Step-by-Step Solution:

1. **Understanding Metamorphosis**:
- Metamorphosis is a biological process by which an animal undergoes a significant change in form or structure during its life cycle. This often includes distinct stages such as egg, larva, pupa, and adult.

2. **Identifying the Options**:
- We need to look at the given options (though they are not explicitly listed in the question, we will assume common examples like earthworm, asterisks, housefly, and butterfly).

3. **Analyzing Each Option**:
- **Earthworm**:
- Earthworms develop directly from eggs into young earthworms without undergoing any larval stage. Hence, they do not exhibit metamorphosis.
- **Asterisks (Starfish)**:
- Starfish have a larval stage (bipinnaria) that is quite different from the adult form, indicating that they do undergo metamorphosis.
- **Housefly**:
- Houseflies have a complete metamorphosis that includes egg, larval (maggot), pupal, and adult stages.
- **Butterfly**:
- Butterflies undergo complete metamorphosis, transitioning through egg, larval (caterpillar), pupal (chrysalis), and adult stages.

4. **Conclusion**:
- Based on the analysis, the only organism that does not undergo metamorphosis is the **earthworm**. Therefore, the correct answer is the earthworm.

### Final Answer:
The animal that has no metamorphosis in its life cycle is the **earthworm**.

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