Name the principle or process of exchange of gases.

Explanation

**Step-by-Step Solution:**

1. **Identify the Location of Gas Exchange**: The primary site for gas exchange in the human body is the lungs, specifically within the alveoli, which are tiny air sacs.

2. **Understand the Gases Involved**: The main gases exchanged are oxygen (O2) and carbon dioxide (CO2). Oxygen is inhaled from the atmosphere, while carbon dioxide is a waste product produced by cells during respiration.

3. **Recognize the Process of Gas Exchange**: The exchange of gases occurs through a process called diffusion. This is where gases move from an area of higher concentration to an area of lower concentration.

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