Answer:
Not a scientific question bevause it asks about what people think instead of how nature works
Exhaled air has more carbon dioxide because the blood contains some carbon dioxide (a waste product) that is transferred to the air in the lungs, which is then exhaled. The result is that the exhaled air contains less oxygen and more carbon dioxide than the inhaled air. The air in the lungs also becomes humidified with water before it is exhaled.
That they are <span>caused by microorganisms.</span>
