In which of the following animal tympanum represents the ear and skin is moist?

Options

A. Crocodilus and Salamandra
B. Salamandra and Rana
C. Testudo and Bungarus
D. Hemidactylus and Chelone

Answer

To solve the question "In which of the following animal tympanum represents the ear and skin is moist?", we will analyze the options provided and identify the correct answer based on the characteristics of the tympanum and skin moisture.

### Step-by-Step Solution:

1. **Understanding Tympanum**: The tympanum is an external ear structure found in some animals, particularly amphibians and reptiles. It is crucial to identify which animals have a tympanum that represents the ear and whether their skin is moist.

2. **Analyzing the Options**:
- **Option 1: Crocodilus (Crocodile) and Salamandra (Salamander)**:
- Crocodiles are reptiles with dry skin, and their tympanum is not moist.
- Salamanders are amphibians, and they have moist skin. They do have a tympanum that represents the ear.
- Conclusion: This option has mixed characteristics (one moist, one dry).

- **Option 2: Rana (Frog) and Salamandra (Salamander)**:
- Frogs (Rana) are amphibians with moist skin and have a tympanum that represents the ear.
- Salamanders also have moist skin and a tympanum.
- Conclusion: Both animals in this option have moist skin and a tympanum.

- **Option 3: Testudo (Tortoise) and Burnerus (a type of lizard)**:
- Tortoises are reptiles with dry skin and a tympanum that is not moist.
- Lizards also have dry skin and a tympanum that is not moist.
- Conclusion: Both animals in this option have dry skin.

- **Option 4: Hymidactylus (Gecko) and Ceylon (another reptile)**:
- Geckos are reptiles with dry skin and a tympanum that is not moist.
- Ceylon (likely referring to a species of lizard) also has dry skin.
- Conclusion: Both animals in this option have dry skin.

3. **Identifying the Correct Option**:
- After analyzing all options, **Option 2 (Rana and Salamandra)** is the only pair where both animals have a tympanum that represents the ear and moist skin.

### Final Answer:
The correct answer is **Option 2: Rana (Frog) and Salamandra (Salamander)**.