What is the contribution of the following in breathing?
Diaphragm

Explanation

### Step-by-Step Solution:

1. **Understanding the Diaphragm**:
- The diaphragm is a dome-shaped muscular and membranous structure located at the base of the thoracic cavity. It separates the thoracic cavity (chest) from the abdominal cavity.

2. **Role in Breathing**:
- The diaphragm is the principal muscle involved in the process of respiration (breathing).

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