How do facial features of H. heidelbergensis compare to H. erectus?

The correct answer highlights the differences in brow ridge size and facial structure between H. heidelbergensis and H. erectus. H. heidelbergensis exhibits smaller and more separated brow ridges when compared to H. erectus, which is characterized by prominent and continuous brow ridges. This distinction is significant because it reflects an evolutionary trend towards a more modern facial structure in H. heidelbergensis, indicating a shift in both morphological features and possibly even social behaviors or adaptations related to their environments.

Such variations in cranial features also provide insight into the evolutionary adaptations of different hominin species. The shift toward smaller and more separated brow ridges in H. heidelbergensis may suggest changes in brain size and cognitive capabilities, an essential aspect of human evolution. Understanding these features helps researchers piece together the complexities of human ancestry and the traits that defined early human species.