Final answer:
Paleoanthropologists and archaeologists have identified various criteria to classify early Homo species, including brain size, tool use, dentition, postcranial features, and bipedal locomotion.
Step-by-step explanation:
Paleoanthropologists and archaeologists have made significant discoveries and advancements in understanding early Homo species. Some criteria used to classify a species under the genus Homo include brain size, tool use, dentition, postcranial features, and bipedal locomotion. For example, Homo habilis had a larger brain size than australopithecines and had hands capable of tool-making due to changes in bone structure and thumb positioning.