Identify the type of joint/s that is/are being used in the action for carrying out the following activities.
Nodding to say yes

Explanation

### Step-by-Step Solution:

1. **Understanding the Action**: The action of nodding to say "yes" involves moving the head up and down.

2. **Identifying the Body Part Involved**: The primary body part involved in this action is the neck, specifically where the head connects to the spine.

3. **Identifying the Joint Type**: The joint that allows for this nodding motion is known as a pivot joint.

4. **Explaining the Pivot Joint**: The pivot joint in the neck is formed between the first two cervical vertebrae, known as the Atlas and Axis. This joint allows for rotational movement, which is essential for nodding the head.

5. **Conclusion**: Therefore, the type of joint used when nodding to say "yes" is a pivot joint.