Feather -like gills occur in

Options

A. echinoderms
B. molluscs
C. hemichordates
D. prawns

Answer

To answer the question "Feather-like gills occur in," we can follow these steps:

### Step-by-Step Solution:

1. **Understanding the Question**: We need to identify which group of organisms has feather-like gills.

2. **Analyzing the Options**: The options provided are:
- Echinoderms
- Mollusks
- Hemichordates
- Prawns

3. **Identifying Characteristics of Each Group**:
- **Echinoderms**: This group includes starfish and sea urchins, which do not have feather-like gills.
- **Mollusks**: Mollusks, such as snails, clams, and squids, possess a structure known as a mantle cavity, where feather-like gills are located. These gills serve both respiratory and excretory functions.
- **Hemichordates**: This group includes acorn worms, which do not have feather-like gills.
- **Prawns**: Prawns are crustaceans and have gills, but they are not feather-like; they have a different structure.

4. **Conclusion**: Based on the characteristics of these groups, the only group that has feather-like gills is **Mollusks**.

5. **Final Answer**: Feather-like gills occur in **Mollusks**.