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Advantages of breathing through the nose are : 1- The tiny capillaries in the nose warms up air before going in to the lungs. 2- The nose hair traps any unwanted bodies and dust . Breathing through the nose has its advantages, but it also comes at a price as many people get headaches after breathing through the nose too much. It is also known to aggravate those around you.
breathing in through your nose is internal, breathing out through your mouth is external.
For elephants, the trunk is the same as a nose is to most animals. Breathing through the nose is natural. Breathing through the mouth is not comfortable.
Breathing
through your mouth or nose
The germs in the air go through the hair in your nose and get caught in it, when they go through your mouth the bacteria is heading into your lungs and drys out your mouth if you sleep breathing through your mouth.
You breathe in through the nose.
By breathing in the air around them through their nose
Actually breathing in with your nose and out with your mouth is best while running, the nose acts as a natural filter for the air you breath in.
Unless it is blocked, there is no disadvantage. Breathing through the nose is the first stage of filtration due to the hair up your nose (that's why we shouldn't trim it too far back). Breathing through the mouth does not afford this extra dirt trapping mechanism.
the process of brething in through the nose
The nose hairs help filter the air you breath.