Question

one should Breathe by nose and not my mouth explain​

Answer 1

Our nose prevents many pollutants including dust and smog to enter our lungs. They have hair which prevent foreign particles entering our lungs.

Answer 2

Explanation:

we should breath by nose and not by mouth because nose has small hairs which captures the impurities present in air and not allow them to go inside our body, but mouth cannot do this.