Sea Mouse belongs to phylum

Options

A. Chordata
B. Mollusca
C. Annelida
D. Echinodermata

Answer

To determine the phylum to which the sea mouse belongs, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Common Name**: The sea mouse is also known as "Aphrodites." This is an important clue as it helps us relate to the organism's classification.

2. **Review the Options**: The options provided are:
- Chordates
- Mollusca
- Annelida
- Echinodermata

3. **Analyze the Characteristics of Sea Mouse**:
- The sea mouse has a unique appearance and behavior that resembles a mouse, which is why it is named so.
- It possesses bristle-like structures known as "setae" or "chaetae."
- The body of the sea mouse shows segmentation, which is a key characteristic of certain phyla.

4. **Evaluate Each Option**:
- **Chordates**: While they can exhibit segmentation, they do not have bristle-like structures. Thus, this option is incorrect.
- **Mollusca**: Mollusks do not have segmentation or bristle-like structures, making this option incorrect.
- **Echinodermata**: Echinoderms are characterized by their radial symmetry and a specialized vascular system. They do not exhibit segmentation or bristle-like structures, so this option is also incorrect.
- **Annelida**: Annelids are known for their segmented bodies and the presence of bristle-like structures (setae). This matches the characteristics of the sea mouse.

5. **Conclusion**: Based on the analysis, the sea mouse belongs to the phylum **Annelida**.

### Final Answer: Sea Mouse belongs to the phylum Annelida.

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