Connecting link between Amphibia and Reptilia is

Options

A. Seymouria
B. Ophiosaurus
C. Testudo
D. Chelone

Explanation

To determine the connecting link between Amphibia and Reptilia, we need to identify an organism that exhibits characteristics of both groups. Let's break down the solution step by step:

### Step-by-Step Solution:

1. **Understanding the Question**:
- We need to find an organism that serves as a connecting link between Amphibia (frogs, salamanders) and Reptilia (lizards, snakes, turtles).

2. **Analyzing the Options**:
- The options provided are:
1. Cimoria
2. Opiosaurus
3. Testudo
4. Chillon

3. **Identifying the Correct Organism**:
- Among the options, we need to identify which one shows characteristics of both amphibians and reptiles.

4. **Researching Cimoria**:
- Cimoria is known to be an extinct organism that lived during the Permian period. It is significant because it exhibits traits of both amphibians and reptiles.

5. **Characteristics of Cimoria**:
- The larval stage of Cimoria displays amphibian-like features, such as a dependence on water for reproduction and a similar body structure.
- The adult stage of Cimoria shows reptilian characteristics, indicating a transition from aquatic to terrestrial living.

6. **Conclusion**:
- Based on the characteristics and the analysis, Cimoria is identified as the connecting link between Amphibia and Reptilia.

### Final Answer:
The connecting link between Amphibia and Reptilia is **Cimoria**.

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