Question

Approximately 2 million years ago the genus Australopithecus gave rise to a new genus, Homo. Today, we retain the genus as Homo sapiens. What important fossil evidence MOST likely helped scientists change the classification of those early human ancestors? A) opposable thumb B) teeth and skull size C) pelvis and leg bones D) spine alignment and foot size

Answer 1

The Correct answer is B.Teeth And Skull Size trust me i had this on usa test prep (look at screenshot)

Answer 2

D - spine alignment and foot size.

Late australopiths had an S-shaped spine that allowed for balance when standing. Shorter and less flexible toes made pushing off the ground much easier.