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Air enters the body and is warmed as it travels through the mouth and nose. It then enters the trachea. The trachea divides into two bronchi. One bronchus enters each lung. Each bronchus branches out ...
Air enters the body and is warmed as it travels through the mouth and nose. It then enters the trachea. The trachea divides into two bronchi. One bronchus enters each lung. Each bronchus branches out ...
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