Final answer:
Anatomical automorphies of modern Homo sapiens include small jaws and teeth, a sagittal keel on top of the skull, well-developed chins, prominent supraorbital ridges, skull shape resembling H. erectus or H. habilis, bipedal locomotion, and human-like feet with arches and ankles.
Step-by-step explanation:
Anatomical automorphies are distinctive features or characteristics that are unique to a particular species. For modern Homo sapiens, some of these automorphies include:
- Small jaws and teeth
- A sagittal keel on top of the skull
- Well-developed chins
- Prominent supraorbital ridges (brow ridges)
- Skull shape resembling H. erectus or H. habilis
- Bipedal locomotion with a human-like gait
- Human-like feet with arches and ankles
These features distinguish modern humans from archaic Homo species, such as Homo heidelbergensis, Homo rhodesiensis, and Homo neanderthalensis, which had similar brain sizes but differed in cranial structure and other anatomical traits.