Which of the following animal has a diaphragm between the thorax and abdomen ?

Options

A. Frog
B. Lizard
C. Pigeon
D. Whale

Answer

To determine which of the following animals has a diaphragm between the thorax and abdomen, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Function of the Diaphragm**: The diaphragm is a muscular structure that separates the thoracic cavity (which contains the heart and lungs) from the abdominal cavity (which contains the digestive organs). It plays a crucial role in respiration.

2. **Identify the Animals Given**: The options provided are:
- A) Frog
- B) Lizard
- C) Pigeon
- D) Whale

3. **Classify the Animals**:
- Frogs are amphibians.
- Lizards are reptiles.
- Pigeons are birds.
- Whales are mammals.

4. **Determine Which Group Has a Diaphragm**:
- Diaphragms are primarily found in mammals. They help in the breathing process by contracting and relaxing to change the pressure in the thoracic cavity.
- Frogs, lizards, and pigeons do not possess a diaphragm. Instead, they rely on different mechanisms for respiration.

5. **Identify the Correct Answer**: Since whales are mammals, they possess a diaphragm. Therefore, the correct answer is:
- **D) Whale**

### Final Answer:
The animal that has a diaphragm between the thorax and abdomen is **D) Whale**.

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