Answers

2016-06-23T20:49:09+08:00
Nose
Pharynx
Larynx
Trachea
Bronchi
Bronchioles
Lungs
Alveoli

that's the pathway of the oxygen
1 5 1
2016-06-23T20:58:43+08:00
The path way is divided into many branches in order for the oxygen to be distributed in all parts of our lungs..^_^





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