Sea lily belongs to the phylum:

Options

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

Answer

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

### Step-by-Step Solution:

1. **Identify the Characteristics of Sea Lily**:
- Sea lilies are marine animals that resemble plants.
- They exhibit radial symmetry.
- They possess a water vascular system.

2. **Consider the Possible Phyla**:
- The question provides several phyla to consider: Chordata, Arthropoda, Annelida, and Echinodermata.

3. **Analyze Each Phylum**:
- **Chordata**: Characterized by the presence of a notochord and nerve cord. Sea lilies do not exhibit these traits.
- **Arthropoda**: Includes insects and is characterized by a chitinous exoskeleton and jointed appendages. Sea lilies do not fit this description.
- **Annelida**: This phylum includes segmented worms. Sea lilies are not worms and do not belong here.
- **Echinodermata**: This phylum includes marine animals with a water vascular system and radial symmetry. Sea lilies fit these characteristics.

4. **Conclusion**:
- Based on the analysis, the sea lily belongs to the phylum **Echinodermata**.

### Final Answer:
Sea lily belongs to the phylum **Echinodermata**.

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