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Question
The parts of the respiratory tract that is responsible for keeping us healthy by preventing the entry of germs are:
The parts of the respiratory tract that is responsible for keeping us healthy by preventing the entry of germs are:
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Solution
The correct option is D All of the above
The trachea, bronchi and the nasal cavity are lined up with a ciliated mucous membrane which traps the dust and germs and prevents them from entering the lungs. Therefore, all of the above parts of the respiratory tract are responsible for keeping us healthy by preventing the entry of germs. 
All of the above
The trachea, bronchi and the nasal cavity are lined up with a ciliated mucous membrane which traps the dust and germs and prevents them from entering the lungs. Therefore, all of the above parts of the respiratory tract are responsible for keeping us healthy by preventing the entry of germs.
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