Write the function of cartilage.

Explanation

### Step-by-Step Solution:

1. **Definition of Cartilage**:
- Cartilage is a type of connective tissue that is flexible and provides support and structure to various parts of the body.

2. **Supportive Structure**:
- Cartilage serves as a supportive structure in various body parts. For example, it forms the shape of the external ear, allowing it to maintain its structure while remaining flexible.

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