Question

Why should you breathe through your nose and not your mouth ?

Answer 1

because we have a specific organ nose which help us in breathing where as mouth is help in eating of food therefore due to of a separate specific organ 4 breeding we use our nose except mouth

Answer 2

Nose is having small hairs in it , when we breath in we breathe many dust particles along with the air but it gets stuck to the nose hair preventing it from being inhaled which doesn't happen when we breathe through the mouth.