What is not a benefit of breathing through the nose?

Nasal breathing drives oxygen more efficiently into the lower lobes of the lungs rather than staying in the upper lobes as in mouth breathing. With nasal breathing, all five lobes of the lungs are used to breathe rather than just the upper two. The lower lobes of the lungs have more parasympathetic, calming and repairing nerve receptors which are activated during nasal breathing exercise. The upper lobes have more sympathetic or fight or flight stress receptors that are activated during mouth breathing exercise.

Explanation:

a "theory" a suggestion that is not 100 % accurate, or a figure. some people say its a theory because they of all the passed theory's about one subject. it depends sometimes theory might be accurate and sometimes they are.

the answer u all are looking for is 4000000000000000000000 million years.