Why can we breathe with both mouth and noze, can every mammals do it and what’s the use ? If we couldnt breathe with mouth we wouldnt suffocate after swallowing wrong ?

Question

Why can we breathe with both mouth and noze, can every mammals do it and what’s the use ? If we couldnt breathe with mouth we wouldnt suffocate after swallowing wrong ?

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Answer 1

If you couldn’t breathe with your mouth, a stuffy nose would potentially be lethal. More importantly for selection pressure, being able to breathe from your mouth gives you the ability to pant (also see: dogs), which gives you longevity when doing physical activity – like chase prey.