Karl Fogel at
Today's evolutionary moment: I can breathe with my nose but not my
mouth, but I can't breathe with my mouth and not my nose. What's up
with that? (Bonus points: why can't I breathe with only one nostril at a
time?)
McClane likes this.
Surely you can do those things with help from your hand. What's up is that there's no advantage in your nose to being able to open and close itself. A mouth without this ability would be terrible at biting and chewing. What am I missing?