In which bones can bone marrow chiefly be found? Is bone marrow made of bone tissue?

Explanation

**Step-by-Step Solution:**

1. **Identify the Types of Bones Containing Bone Marrow:**
- Bone marrow is chiefly found in two types of bones: long bones and flat bones.

2. **List Examples of Long Bones:**
- Examples of long bones include:
- Humerus (upper arm bone)
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