Haile - Selassie and his colleagues argue that the fossils differ from those of Lucy's species in several ways, having smaller teeth, more forward - facing cheekbones, a more robust lower jaw, and thicker
outer enamel on some teeth.
Teeth in the upper jaw have more ridges and enamel on the outer edge, while the reverse is true for bottom t
Teeth in the upper jaw have more ridges and
enamel on the
outer edge, while the reverse is true for bottom
teethteeth.