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Answer:
1. For the first question, the correct answer is: b. consult a doctor.
2. The correct answer is: a. Nitrogen.
3. The best way to avoid diseases of the heart and lungs should be: d. all of these.
4. The organ for gas exchange inside the human lungs that looks like grapes is: b. alveoli.
5. When the passage of air in the mouth is blocked by mucus and we can't breathe, it is called: a. pharyngolarynx.
6. The part that receives air from the nasal cavity is: d. nasal cavity.