What is the name of the partition between thorax and abdomen?

Explanation

**Step-by-Step Solution:**

1. **Identify the Cavities**: In humans, the body is divided into different cavities, primarily the thoracic cavity (chest area) and the abdominal cavity (stomach area).

2. **Understand the Separation**: These two cavities are separated by a specific structure that plays a crucial role in respiration.

3. **Name the Structure**: The structure that separates the thoracic cavity from the abdominal cavity is called the **diaphragm**.

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