Unique feature of molluscs is

Options

A. segmentation
B. mantle
C. Aristotle's lantern
D. spiny skin

Answer

**Step-by-Step Solution:**

1. **Understanding the Question**: The question asks for the unique feature of molluscs. To answer this, we need to identify characteristics that are specific to the phylum Mollusca.

2. **Identifying Features**: The options provided in the question include:
- Segmentation
- Mantle
- Aristotle's lantern
- Spiny skin

3. **Analyzing Each Feature**:
- **Segmentation**: This is a characteristic of the phylum Annelida (segmented worms) and not a feature of molluscs.
- **Mantle**: This is a unique feature of molluscs. The mantle is a significant part of their anatomy that covers the visceral mass and is involved in respiration, waste disposal, and secretion of the shell.
- **Aristotle's Lantern**: This is a structure found in echinoderms (like sea urchins) and is not related to molluscs.
- **Spiny Skin**: This is also a characteristic of echinoderms, not molluscs.

4. **Conclusion**: The unique feature of molluscs is the **mantle**. This structure is essential for their respiratory system, waste management, and shell production.

**Final Answer**: The unique feature of molluscs is the **mantle**.

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