When a fracture occurs, bones heal naturally with out any treatment.

Explanation

### Step-by-Step Text Solution:

1. **Understanding Fractures**: A fracture is defined as a crack or break in a bone. This is the initial step in understanding how bones can heal.

2. **Natural Healing Process**: When a fracture occurs, the body has a natural ability to heal itself without the need for special medications or treatments. This is an important point to note.

3. **Role of Stem Cells**: The healing process is facilitated by stem cells present in our bones. Stem cells have the unique ability to renew themselves and play a crucial role in the repair of fractured bones.

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