Alphysia shows all of these properties , except

Options

A. Organ system level of organization
B. Segmentation
C. Bilateral symmetry
D. Triploblastic coelomate

Answer

To solve the question regarding the properties of Aplysia, we will analyze each option provided and determine which one does not apply to this organism.

### Step-by-Step Solution:

1. **Understanding Aplysia**: Aplysia, commonly known as the sea hare, belongs to the phylum Mollusca. It is important to know its basic characteristics to answer the question.

2. **Analyzing the Options**:
- **Option A: Organ system level of organization**:
- Aplysia has an organ system level of organization. This means that its cells form tissues, tissues form organs, and organs work together in organ systems. Therefore, this option is a property of Aplysia.

- **Option B: Segmentation**:
- Aplysia is characterized by an unsegmented body structure. Segmentation refers to the division of the body into repetitive segments, which is not a feature of Aplysia. Thus, this option is not a property of Aplysia.

- **Option C: Bilateral symmetry**:
- Aplysia exhibits bilateral symmetry, meaning that if you draw a line down the center, both halves are mirror images of each other. This is indeed a property of Aplysia.

- **Option D: Triploblastic coelomates**:
- Aplysia is triploblastic, meaning it has three germ layers (ectoderm, mesoderm, and endoderm), and it is also a coelomate, which means it has a body cavity (coelom). Therefore, this option is also a property of Aplysia.

3. **Conclusion**:
- After analyzing all the options, the only characteristic that does not apply to Aplysia is **segmentation** (Option B). Aplysia is unsegmented, making this the correct answer to the question.

### Final Answer:
**Segmentation (Option B) is the property that does not apply to Aplysia.**