Answer :

inhaled air⇒nose⇒trachea[wind pipe]⇒bronchi⇒lungs⇒bronchioles⇒tertiary bronchioles⇒alveoli[air sacs]
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Air enters  (a)nostrils passes through the (b)nasopharynx, (c) the oral pharynx through the (d) glottis into  (e)trachea  then into the right and left (f) bronchi and  into (g) bronchioles.

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