Which one of the following animal is radiallyl symmetrical.

Options

A. Sycon
B. Euspongia
C. Adamsia
D. All of the above

Answer

To determine which animal is radially symmetrical, we can follow these steps:

### Step-by-Step Solution:

1. **Understand Radial Symmetry**:
- Radial symmetry refers to a body plan in which the body can be divided into similar halves by multiple planes passing through the central axis. This means that the organism has a circular arrangement of body parts around a central point.

2. **Identify Options**:
- The question provides a list of animals: Cyclone, U-spongia, and Adam-cia. We need to analyze each one to see if it exhibits radial symmetry.

3. **Analyze Each Option**:
- **Cyclone**: This term is not commonly associated with a specific animal; it may refer to a type of organism but does not clearly indicate radial symmetry.
- **U-spongia**: This is a genus of sponges. Sponges generally exhibit asymmetry or are irregular in shape, thus they do not exhibit radial symmetry.
- **Adam-cia**: This is identified as a genus of sea anemones. Sea anemones are known for their radial symmetry, as their body structure allows for division into similar halves through multiple planes.

4. **Conclusion**:
- Based on the analysis, the correct answer is **C - Adam-cia**, as it is a radially symmetrical animal belonging to the family Hormit-Hire.

### Final Answer:
C - Adam-cia