What is the reason for the nose structure differences between Caucasoid and Negroid types?

In general, the Caucasoid nose is narrow, thin and high - almost continuing downward from the forehead. On the other hand, the Negroid nose is broad, flat and low.

Is there an anthropological explanation for that?

I mean is it the climate differences in Europe and Africa that caused those differences?

And all other races fall somewhere along the line between those two

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