A muscular transverse partition in mammals that separates thorax from abdomen is

Options

A. Diaphragm
B. Pharynx
C. Stomach
D. Duodenum .

Answer

**Step-by-Step Solution:**

1. **Understanding the Question**: The question asks for a muscular structure that serves as a partition between the thoracic cavity (chest) and the abdominal cavity in mammals.

2. **Identifying the Options**: The options provided are:
- Diaphragm
- Pharynx
- Stomach
- Duodenum

3. **Analyzing Each Option**:
- **Diaphragm**: This is a muscular structure that separates the thorax from the abdomen. It plays a crucial role in respiration by contracting and relaxing to allow the lungs to expand and contract.
- **Pharynx**: This is not a partition but a part of the throat that serves as a passage for food and air. It connects the mouth and nasal cavity to the esophagus and trachea.
- **Stomach**: This is an organ involved in digestion, located in the abdominal cavity, and does not serve as a partition.
- **Duodenum**: This is the first part of the small intestine and is also not a partition between the thorax and abdomen.

4. **Conclusion**: Based on the analysis, the correct answer is **diaphragm**. It is the only option that correctly identifies the muscular partition separating the thorax from the abdomen in mammals.

**Final Answer**: The muscular transverse partition in mammals that separates the thorax from the abdomen is the **diaphragm**.

---