Answer: Exhaled air consists of 78 percent nitrogen, 16 percent oxygen, 4 percent carbon dioxide and potentially thousands of other compounds.
Explanation: Does this help???
The cells<span> in this type of carcinoma in situ most commonly appear on areas of the</span>skin<span> exposed to the sun, such as face, ears, and neck. They are more likely to grow deeper into the </span>skin<span>, as well as spread to other areas of the body</span>
Lungs- heart- arteries. Capillaries- veins
I would say reverse psychology