Why did the human nose evolve? That’s an easy one: To hold up eyeglasses. (Ken Ham would probably call that a “just so” explanation. Even a broken watch is correct twice per day—or just once on military time.)
True fact: Fred Hoyle proposed the position of the nostrils under the nose could be to reduce the chances of infection from interstellar viruses.
But Steven J. Gould would call it “the Panglossian paradigm”.