Difference between bone and cartilage is of

Explanation

### Step-by-Step Solution:

1. **Matrix Composition**:
- **Bone**: The matrix of bone is composed of an inflexible material known as **ossein**. This provides strength and rigidity to the bone structure.
- **Cartilage**: In contrast, the matrix of cartilage is made up of a flexible material called **chondrin**, which allows for more flexibility and resilience.

2. **Presence of Calcium Salts**:
- **Bone**: The matrix of bone contains **calcium salts**, which contribute to its hardness and strength.
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