Final answer:
The skull is most likely a specimen of Australopithecus afarensis, an early hominid species with a smaller skull size, sloped forehead, larger teeth, and a prominent jaw. Australopithecus afarensis had a brain size similar to a chimpanzee.
Step-by-step explanation:
Based on the characteristics described, the skull is most likely a specimen of Australopithecus afarensis. This early hominid species lived between two and three million years ago and had a skull resembling modern humans but with smaller size, a sloped forehead, larger teeth, and a prominent jaw. Australopithecus afarensis had a brain size of around 500 cubic centimeters, similar to a chimpanzee.