Why do we , and nearly all animals and birds have two nostrils ?

Question

Why do we , and nearly all animals and birds have two nostrils ?

In: 56

Answer 1

Nostrils perform two functions, breathing and smelling. At any given moment, one nostril may be better at breathing because the other is partially obstructed. But the partially obstructed nostril may be better at smelling certain scents. So having two nostrils helps optimize both functions.

https://www.britannica.com/story/why-do-our-noses-have-two-nostrils