It's an interesting idea -- it could explain our posture,
hairlessness, odd noses, etc.
Some "researchers" have suggested that our distinctive downward-pointing
nostrils are an adaptation to
To prevent water from entering? Why can't we simply close our nostrils, like
AFAIK every single halfway semiaquatic mammal out there? After all, I can
half do it, so it should be very easy to evolve.