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In the respiratory system certain structures allow air to pass from the trachea to the lungs. They are lined with thin muscles and coated with epithelial cells. These structures are called

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6 votes

Answer:

a. bronchial tubes.

Step-by-step explanation:

User Kurozakura
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6 votes

Answer- A: bronchial tubes.

Explanation: Correct on Edg 2020.

User Lepike
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