You are on an archaeological dig in Africa when you find a collection of stone tools along with several skeletons in a cave.These bipedal skeletons date to about 3.5 million years ago and show no evidence of a partially opposable toe.Measurements indicate the brains would have been a little less than a third of the volume of modern humans.The teeth found on these skeletons look more like those of an ape than those of a human.Your skeletal discovery is most likely which of the following?

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Australopithecus afarensis lived around 3.9 to 2.9 million years ago, were bipedal, had small brain sizes, and their teeth were more ape-like, fitting the description given.

You Are on an Archaeological Dig in Africa When You