Features showing that Australopithecus afarensis is a hominin include
A) a large brain.
B) lack of a tail.
C) bipedalism.
D) thin molar enamel.

Question

Quizplus · Accepted Answer

The feature that most clearly shows that Australopithecus afarensis is a hominin is bipedalism. This species walked upright on two legs, which is a defining trait of the hominin lineage.

Answer: B
 Another feature that supports the classification of Australopithecus afarensis as a hominin is the lack of a tail. All other primates have tails, but hominins have lost this feature through evolution.

Answers A and D are incorrect.
 Australopithecus afarensis did not have a larger brain than other australopithecine species, and the thin molar enamel is a trait shared by many primates, not just hominins.

Features Showing That Australopithecus Afarensis Is a Hominin Include