What is the contribution of the following in breathing?
Ribs

Explanation

### Step-by-Step Solution:

1. **Understanding the Structure of Ribs**:
- Ribs are flat, curved bones that form a protective cage around the thoracic cavity.
- In humans, there are 12 pairs of ribs, totaling 24 ribs.

2. **Role of Ribs in Protecting Organs**:
- Ribs serve to protect vital internal organs such as the lungs and heart.
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