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One of the things that Darwin and people of his era commented on, was the smaller proportion of "sense organs" on the face of whites compared to the "savage races".
The idea is that whites are somewhat adapted to civilization, so they are not accustomed to using their eyes, ears, nose, and mouth for survival. But for a savage, this is necessary. So savages have larger and more prominent facial features, in particular on the lower half of the face. While whites have smaller and more refined sense-organs, but a larger cranium.
Pic related, you can see what I'm saying
