Lamprey is not a fish since it does not have

Options

A. Closed blood vascular system
B. Fins
C. Body scales
D. Cranium and vertebral column

Answer

### Step-by-Step Solution:

1. **Understanding Lamprey**: Lampreys are a type of jawless fish belonging to the class Agnatha. They are often studied in the context of their differences from true fish.

2. **Identifying Key Features of Fish**: True fish typically possess certain characteristics that distinguish them from other aquatic animals. Key features include:
- Jaws
- Scales covering their bodies
- A streamlined body shape
- A closed circulatory system

3. **Analyzing Lamprey's Characteristics**:
- **Jaws**: Lampreys lack true jaws. Instead, they have a round, sucker-like mouth.
- **Body Scales**: Lampreys do not have scales, which are a common feature in most fish.
- **Cranium and Vertebral Column**: Lampreys do have a cranium and a vertebral column, similar to fish.

4. **Conclusion**: Since Lampreys do not possess body scales, this is a significant reason why they are not classified as true fish.

5. **Final Answer**: Lamprey is not a fish since it does not have body scales.