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Perhaps it is intended as structural protection of the mouth from the inevitable fall that we bipeds experience.

Does any other animal fall as commonly & dangerously as humans?

We're the only biped without a tail. Not sure how long arms compare to a tail for restoring balance but they are far better protection from falls compared to a chin.

That ought to make our noses smaller by the same logic.

Make the nose smaller to protect what? I do not see the logic.

I have fallen and busted my chin a few times, but never my nose. How about yourself?

make nose smaller to protect the very same nose.

Do people fall and bust their nose?

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