Phylum Mollusca can be distinguished from other invertebrates by the presence of

Options

A. bilateral symmetry and exoskeleton
B. a mantle and gills
C. shell and non-segmented body
D. a mantle and non-segmented body

Explanation

To answer the question regarding how Phylum Mollusca can be distinguished from other invertebrates, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Characteristics of Phylum Mollusca**:
- Phylum Mollusca is known for certain unique features that set it apart from other invertebrate phyla.

2. **Understand the Structure of Mollusca**:
- Mollusca have a **non-segmented body**. This means their body is not divided into segments like in annelids. Instead, they have a distinct head, a muscular foot, and a visceral hump.

3. **Define the Mantle**:
- One of the most distinctive features of mollusks is the presence of a **mantle**. The mantle is a significant structure that covers the internal organs of the mollusk. It is a dorsal layer that plays a crucial role in the protection and functioning of these internal organs.

4. **Consider Other Options**:
- While other characteristics like **bilateral symmetry** and **gills** can be found in other phyla (like Arthropoda), the mantle and non-segmented body are specific to mollusks.

5. **Conclusion**:
- Therefore, the two characteristics that can exclusively distinguish Phylum Mollusca from other invertebrates are the **mantle** and the **non-segmented body**.

### Final Answer:
Phylum Mollusca can be distinguished from other invertebrates by the presence of a **mantle and non-segmented body**.

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