2. What is the purpose of alveoli in the breathing process?
A. passageway of air into the lungs B. cleans, warms, and moistens the air
C. separate the trachea into two branches
D. tiny air sacs in the lungs where gas exchange takes place
A. passageway of air into the lungs B. cleans, warms, and moistens the air
C. separate the trachea into two branches
D. tiny air sacs in the lungs where gas exchange takes place
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Answer:
D. Tiny air sacs in the lungs where gas exchange takes place.
Explanation:
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