Identify the only movable bone in the skull.

Options

A. Lower jaw
B. Upper jaw
C. Cheek bone
D. Nasal bone

Explanation

**Step-by-Step Solution:**

1. **Understanding the Skull**: The skull is a part of the skeletal system that protects the brain. It is primarily made up of bones that are joined together by fixed joints, which means they do not move.

2. **Identifying the Bones of the Skull**: The skull consists of various bones, including the upper jaw, lower jaw, cheekbone, and nasal bone.

3. **Analyzing the Options**:
- **Upper Jaw**: This bone is fixed and does not move.
- **Cheek Bone**: This is also a fixed bone and does not move.
- **Nasal Bone**: This bone is fixed and does not move.
- **Lower Jaw**: This bone is different because it is movable.

4. **Conclusion**: Among the options provided, the only bone that can move is the lower jaw, also known as the mandible. It allows for actions such as chewing.

5. **Final Answer**: The only movable bone in the skull is the **lower jaw** (mandible).

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