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

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charlexis charlexis

09-04-2017
Biology

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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

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atomicmarcus atomicmarcus · Answer 1 · 2017-04-10T05:52:05+02:00

There was two of the same question, but here is the answer again with a little more depth.

D - spine alignment and foot size.

It was only the late Australopiths that had an S-shaped spine. This allowed for them to be bipedal, that is, the ability to walk on two legs as we do. This is because the S-shaped spine allowed them to balance when they were standing. The late Australopiths also have shorter and less flexible toes. These smaller, but sturdier feet made pushing off the ground much easier - aiding in their bipedalism.

pstnonsonjoku pstnonsonjoku · Answer 2 · 2022-04-15T13:29:53+02:00

The most important fossil records are the teeth and skull size.

What is a fossil record?

A fossil record refers to the evolutionary record that over the years have become deeply entreched in sedimentary rocks and can provide valuable information regarding the evolutionary sequence.

The most important fossil records that we have about the Australopithecus is retained in fossil evidence such as teeth and skull size.

Learn more about fossil records: https://brainly.com/question/13805601?