Which of the following animals does not undergo metamorphosis

Options

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

Answer

To determine which of the following animals does not undergo metamorphosis, we need to analyze each option provided in the question. The options are:

1. Starfish
2. Moth
3. Tunicate
4. Earthworm

### Step-by-Step Solution:

**Step 1: Understand Metamorphosis**
- Metamorphosis is a biological process where an organism undergoes a significant change in form or structure during its life cycle. This typically includes stages such as egg, larva, pupa, and adult.

**Hint:** Remember that metamorphosis involves multiple life stages, especially a larval stage.

**Step 2: Analyze Each Option**
- **Option 1: Starfish**
- Starfish belong to the phylum Echinodermata. They do undergo metamorphosis, starting from a larval stage before developing into the adult form.

**Hint:** Echinoderms typically have a larval stage that transforms into the adult.

- **Option 2: Moth**
- Moths are insects and they also undergo metamorphosis. They go through a complete metamorphosis, which includes the egg, larva (caterpillar), pupa (chrysalis), and adult stages.

**Hint:** Insects like moths have distinct life stages, including a larval form.

- **Option 3: Tunicate**
- Tunicates belong to the phylum Chordata and have a larval stage that eventually develops into the adult form. Therefore, they also undergo metamorphosis.

**Hint:** Tunicates have a larval stage that transforms into an adult, indicating metamorphosis.

- **Option 4: Earthworm**
- Earthworms undergo direct development. They do not have a larval stage; instead, they develop directly from the egg to the adult form without any metamorphosis.

**Hint:** Direct development means there are no intermediate larval stages.

**Step 3: Conclusion**
- After analyzing all the options, we conclude that the animal that does not undergo metamorphosis is the **Earthworm** (Option 4).

### Final Answer:
The animal that does not undergo metamorphosis is **Earthworm** (Option 4).

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