Which of the following animals casts skin in one piece ?

Options

A. Chelone
B. Alligator
C. Testudo
D. Naja

Answer

To determine which of the following animals casts skin in one piece, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Process of Skin Shedding**:
- Many reptiles, such as snakes and lizards, undergo a process known as ecdysis or molting, where they shed their skin.

2. **Identify the Animals in Question**:
- The options provided include various reptiles: turtle (cellone), alligator, tortoise (testudo), and cobra (naja).

3. **Focus on Snakes and Lizards**:
- Among the options, we need to identify which of these animals is a snake or lizard, as they are known to shed their skin in one piece.

4. **Analyze the Options**:
- Cellone refers to a turtle, which does not shed its skin in one piece.
- Alligator is not a snake or lizard; it has a different skin shedding process.
- Testudo refers to a tortoise, which also does not shed its skin in one piece.
- Naja refers to a cobra, which is a type of snake.

5. **Conclusion**:
- Since snakes, including cobras, are known to shed their skin in one piece, the correct answer is **naja (cobra)**.

### Final Answer:
The animal that casts skin in one piece is **naja (cobra)**.