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When emphysema develops, the alveoli and lung tissue are destroyed. With this damage, the alveoli cannot support the bronchial tubes. The tubes collapse and cause an “obstruction” (a blockage), which traps air inside the lungs. Too much air trapped in the lungs can give some patients a barrel-chested appearance.
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I say D would be the best answer for this question.
Answer:
O C. Avoiding infected people
Explanation:
avoid close contact with people who are sick.
