An air mass gets its characteristic properties from an area known as the
weather site
source region
classification region
place of origin

blah

explanation:

bc blah

if you know your abc's you should be able to get your answer or just use google

the answer is c because it is most logical.

air enters through the nose, moves through the nasal cavity, the pharynx, the larynx, enters the trachea, moves through the bronchi andbronchioles till the alveoli.