The movement of the lower jaw makes it possible for us to

Options

A. talk
B. chew food
C. think
D. both (a) and (b).

Explanation

### Step-by-Step Solution:

1. **Understanding the Lower Jaw**: The lower jaw, also known as the mandible, is the only movable part of the skull. Most bones in the skull are fixed and do not allow movement.

2. **Functions of the Lower Jaw**: The primary functions of the lower jaw include:
- **Talking**: The movement of the lower jaw is essential for speech. When we talk, we move our jaw to produce different sounds and words.
- **Chewing Food**: The lower jaw plays a crucial role in the process of chewing. It moves up and down and side to side to help break down food.

3. **Identifying the Correct Options**: Based on the functions of the lower jaw:
- The movement of the lower jaw enables us to **talk**.
- The movement of the lower jaw also allows us to **chew food**.

4. **Conclusion**: Therefore, the movement of the lower jaw makes it possible for us to talk and chew food.

### Final Answer:
The movement of the lower jaw makes it possible for us to **talk and chew food**.

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