What is bone marrow? Give it functions.

Explanation

### Step-by-Step Solution:

1. **Definition of Bone Marrow**:
- Bone marrow is a type of tissue found within the marrow cavity of bones. It is classified as vascular adipose tissue.

2. **Types of Bone Marrow**:
- There are two types of bone marrow:
- **Red Bone Marrow**: This type is responsible for the production of blood cells.
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