The difference in the degree of facial prognathism between P. boisei and P. aethiopicus results primarily from

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The difference in the degree of facial prognathism between P. boisei and P. aethiopicus is primarily due to the dramatic reduction in the size of the incisors and canines. This reduction affects the projection of the face, as larger teeth require a more protruding jaw to accommodate them.

The Difference in the Degree of Facial Prognathism Between P