Final answer:
Primitive molars were smaller and had a more pronounced jaw projection compared to early primate molars. Early primate molars were relatively larger and had more specialized features.
Step-by-step explanation:
Primitive molars and early primate molars had several differences. Primitive molars were smaller and had a more pronounced jaw projection (prognathism) compared to early primate molars. Early primate molars, on the other hand, were relatively larger and had more specialized features such as a sagittal keel and a third molar that was larger than the other molars.
Additionally, early primate molars were found in species like australopithecines and some early Homo species, which had a skull shape similar to H. erectus or H. habilis. These species also exhibited other characteristics such as bipedalism, humanlike feet with arches and ankles, and an increase in brain size. Overall, the differences between primitive molars and early primate molars reflect the evolutionary changes that occurred in early primates.