Final answer:
Some unique modifications of the hominid skeleton include small jaws and teeth, a larger third molar, a skull shaped like H. erectus or H. habilis, a sagittal keel, bipedalism with a human gait, and humanlike feet with arches and ankles.
Step-by-step explanation:
Some unique modifications of the hominid skeleton include:
- Small jaws and teeth
- Third molar larger than other molars
- Skull shaped more like H. erectus or H. habilis
- A sagittal keel (as seen in H. erectus)
- Bipedal and walked with a human gait
- Humanlike feet with arches and ankles