Answers

2016-04-24T10:11:15+05:30
Nostrils

nasal cavity

pharynx

larynx

trachea

bronchus

bronchioles

alveolus

blood.

0
2016-04-24T10:16:48+05:30
Nostrils
nasal cavity
pharynx
larynx
trachea
bronchus
bronchioles
alveolus
blood
0