Which of the following is a fresh water sponge ?

Options

A. Scypha
B. Euspongia
C. Euplectella
D. Spongilla

Answer

To determine which of the following options is a fresh water sponge, we will analyze each option provided:

1. **Identify the Options**: The options given are:
- A) Skyfa
- B) U spongia
- C) Eucleic tela
- D) Spongilla

2. **Analyze Each Option**:
- **Option A: Skyfa**: This sponge is known to belong to the group of marine sponges. Therefore, it cannot be the answer to our question regarding fresh water sponges.
- **Option B: U spongia**: Similar to Skyfa, U spongia is also classified as a marine sponge. Thus, it is not the correct answer.
- **Option C: Eucleic tela**: Commonly referred to as the Venus flower basket, this sponge is also a marine sponge. Hence, it cannot be the answer.
- **Option D: Spongilla**: Spongilla is recognized as a common fresh water sponge. It inhabits fresh water environments such as ponds and lakes and belongs to the class Desmospongiae.

3. **Conclusion**: After analyzing all the options, the only sponge that is classified as a fresh water sponge is **Spongilla**.

### Final Answer:
**D) Spongilla** is the fresh water sponge.