Final answer:
Archosaur skulls are unique due to small jaws and teeth, a sagittal keel, bipedalism, and humanlike feet.
Step-by-step explanation:
Archosaur skulls are unique compared to skulls of other organisms of the same type due to several characteristics. Archosaurs have small jaws and teeth, with the third molar often being larger than other molars. Their skulls are shaped more like Homo erectus or Homo habilis, with a sagittal keel, a small raised ridge on top of the skull. Furthermore, archosaurs are bipedal and walk with a human gait, and they have humanlike feet with arches and ankles.