Chapter 20, Problem 7STP

Summary Introduction

Introduction :

The fossils discovery suggests that the australopithecines and earlier hominoids are just reverse of each other. The autralopithecines have evolved massive jaws, cranial skeletons, and molar teeth that help in increase the chewing forces. They have a difference in the bipedal the earlier hominoids have comparatively longer legs.

Answer to Problem 7STP

Correct answer :

The correct answer is option (B) bipedalism.

Explanation of Solution

Explanation/justification for the correct answer :

Option (B) bipedalism. The characteristic that distinguishes the australopithecines from earlier hominoids is bipedalism. The autraopithecines is human and ape like combination, they walk on two legs. So, the correct answer is option (B).

Explanation for incorrect answer :

Option (A) binocular vision. The binocular vision of both australopithecines and hominoids has no much difference. So, this is an incorrect option.

Option (C) finger nails. The finger nail of both australopithecines and hominoids has no much difference. So, this is an incorrect answer.

Option (D) opposable thumb. The australopithecines and hominoids both have opposable thumb. But the earlier hominoid has evolved one. So, this is an incorrect answer.