Aveoli are the small sacks in the lungs, where gases such as oxygen and carbon dioxide are transferred into/out of the blood stream. Blood would be the answer, as blood is not transferred through alveoli; it stays in blood vessels and is oxygenated at the alveoli.
The answer is B.50% of American adults do not exercise ima. regular basis.
All of them because tobacco can cause lung cancer and it’s addicting, and you can die from smoking, alcohol you can become addicted and become a drug addict, and it can ruin your liver, illegal drugs can also be addicting and those can kill you, and sexual activity can be risky because you can get pregnant if you’re not careful.