The two main branches of the trachea are the:
A) bronchioles.
B) alveoli.
C) cilia.
D) bronchi.
D
Explanation: A) The bronchioles are small branches of the bronchi.
B) The alveoli are the air sacs in the lungs.
C) Cilia are hairlike structures in the trachea and bronchi.
D) Correct.
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