Which of the following vertebra is amphicoelous type in frog?

Options

A. 3rd
B. 8th
C. 9th
D. 10th

Explanation

To determine which vertebra is amphicoelous in frogs, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Classification of Frogs**:
- Frogs belong to the class Amphibia. This classification is important because it provides context for their anatomical features.

2. **Identify the Number of Vertebrae in Frogs**:
- Frogs typically have a total of 10 vertebrae. This includes the vertebrae in the spinal column and the urostyle, which is a fused structure.

3. **Define Amphicoelous Vertebrae**:
- Amphicoelous vertebrae are characterized by having two concave surfaces, one on the anterior side and one on the posterior side. This shape allows for flexibility and movement.

4. **Locate the Amphicoelous Vertebra in Frogs**:
- Among the 10 vertebrae present in frogs, the 8th vertebra is identified as amphicoelous. This means it has the biconcave structure typical of amphicoelous vertebrae.

5. **Select the Correct Answer**:
- Based on the information gathered, the correct answer to the question is option B, which corresponds to the 8th vertebra.

### Final Answer:
The amphicoelous vertebra in frogs is the 8th vertebra.

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