While studying with you for an exam, a classmate claims that the only difference between australopithecines and early Homo species is that the latter had a bigger brain. What example could you give to demonstrate that there are other differences?

Homo species have smaller faces and teeth

Explanation:

The homo species has a larger brain as compared to the primitive Australopithecus and other hominin species. Along with this feature the homo species also have a smaller face as well as teeth as compared to the Australopithecus and other related species. These features give the morphology of homo species a form of modern human. These features distinguish the humans from ape like ancestors. Although humans still retain some ape like features like long arms and slightly prognathic face.

not only is it colder, it also becomes darker, less salty, and more dense.