Can free electrons move in and out of the body?

Explanation

To answer the question "Can free electrons move in and out of the body?", we can break it down into a few key points:

### Step-by-Step Solution:

1. **Understanding Free Electrons**:
- Free electrons are electrons that are not bound to any atom and can move freely within a material. They are typically found in conductive materials like metals.

2. **Body as a Conductor**:
...