Which statement is incorrect about the members of annelida?

Options

A. they are the triploblastic animals
B. they have an incomplete digestive system
C. closed circulatory system is found in them
D. Metameric segmentation is an importatnt characteristic of annelids.

Explanation

To determine which statement is incorrect about the members of the phylum Annelida, we can analyze each statement based on the characteristics of annelids.

### Step-by-Step Solution:

1. **Identify the Characteristics of Annelids**:
- Annelids are segmented worms, which means their bodies are divided into segments.
- They are triploblastic, meaning they develop from three germ layers: ectoderm, mesoderm, and endoderm.
- They possess a complete digestive system, which includes a mouth and an anus.
- Annelids have a closed circulatory system, where blood is contained within vessels.

2. **Evaluate Each Statement**:
- **Statement 1**: "They are triploblastic animals."
- This statement is **correct** as annelids do develop from three germ layers.
- **Statement 2**: "They have an incomplete digestive system."
- This statement is **incorrect** because annelids have a complete digestive system that runs from mouth to anus.
- **Statement 3**: "Metameric segmentation is an important characteristic of the annelids."
- This statement is **correct** as segmentation is a defining feature of annelids.
- **Statement 4**: "A closed circulatory system is found in them."
- This statement is also **correct** as annelids possess a closed circulatory system.

3. **Conclusion**:
- The incorrect statement about the members of Annelida is that they have an incomplete digestive system.

### Final Answer:
The incorrect statement about the members of Annelida is: "They have an incomplete digestive system."

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