Which one is characteristic of mollusca ?

Options

A. Radula
B. Aristotle's lantern
C. Mantle
D. Both 1 & 3

Answer

### Step-by-Step Solution:

1. **Identify the Phylum**: The question asks about characteristics of the phylum Mollusca. Mollusca is a diverse group of animals that includes snails, clams, squids, and octopuses.

2. **Understand Key Characteristics**:
- Mollusca are primarily marine or aquatic organisms.
- They possess a unique feeding structure known as the **radula**, which is used for cutting and chewing food.
- Another significant feature is the **mantle**, which is a protective layer that covers the visceral mass of the mollusk.

3. **Differentiate from Other Structures**:
- The question mentions **Aristotle's lantern**, which is not a characteristic of Mollusca but rather a structure found in Echinoderms (like sea urchins). This helps to eliminate options that include Aristotle's lantern as a characteristic of Mollusca.

4. **Conclude with Correct Characteristics**:
- The correct characteristics of Mollusca are the **radula** and the **mantle**. Therefore, if the options provided include both of these features, that would be the correct answer.

5. **Final Answer**: Based on the characteristics discussed, the correct answer is that both the radula and mantle are characteristics of Mollusca.