After drying, a bath sponge contains

Options

A. Hold fast
B. Tentacles
C. Spicules
D. Spongin fiber

Answer

To solve the question "After drying, a bath sponge contains," we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Common Name and Scientific Classification**:
- A bath sponge is commonly known as "spongilla."
- It belongs to the phylum Porifera and the class Demospongiae.

2. **Understand the Composition of a Bath Sponge**:
- Bath sponges are composed of a skeleton made up of various materials.
- When a sponge dries, it loses its water content and the soft, living tissues.

3. **Determine What Remains After Drying**:
- After drying, the sponge retains its skeletal structure.
- The skeleton of a sponge is primarily made up of spongin fibers.

4. **Analyze the Options**:
- A. Holdfast: This is a structure used by some organisms to anchor themselves, not relevant to sponges.
- B. Tentacle: This is associated with organisms like jellyfish, not sponges.
- C. Spicules: These are skeletal elements found in some sponges, but they are not the main component after drying.
- D. Spongy Fibers: This refers to spongin fibers, which are the organic material that remains after the sponge dries.

5. **Conclusion**:
- The correct answer is D. Spongy Fibers, as they are the primary component that remains after a bath sponge dries.

### Final Answer:
D. Spongy Fibers