Consider species A, B, and C, who share a knuckle-walking common ancestor. Species A and B are bipedal. Species C is a knuckle walker. Which of the following is most likely to be true?
A) A and B are more closely related to each other than to C.
B) A and C are more closely related to each other than to B.
C) C and B are more closely related to each other than to A.
D) A, B and C most likely emerged at the same time from the common ancestor.

Question

Quizplus · Accepted Answer

Since A and B share the trait of bipedalism which is different from C's knuckle-walking, it is more likely that A and B share a more recent common ancestor than either of them do with C. Therefore, A and B are more closely related to each other than to C.

Consider Species A, B, and C, Who Share a Knuckle-Walking