Answers

2016-04-25T22:08:39+05:30
Thats coz in the nose we have hair which stops dust particles and also mucus where the dust sticks and its safer as at times dust may have some bacteria 
1 5 1
2016-04-25T22:13:50+05:30
Our nose contains some hair...this hair filters oxygen rich air from pollutants.....by this it becomes safe for us to inhale...........but when we breathe through mouth , unpurified air goes in,this makes us unhealthy............
2 5 2