Question

Which of the following structure pairs provides the best evidence of a common ancestor based on the anatomical similarities?
A
Bee wings and bird wings
B
Legs on a beetle and legs on a cat
C
Whale flipper and bat wing
D
Human eyebrows and ant antennas

Answer 1

C

Whale flippers and bat wings are homologous structures — both are modified forelimbs of mammals with the same basic bone elements (humerus, radius, ulna, etc.), so their similarity reflects common ancestry. The others are analogous or unrelated (bee vs bird wings are convergent, beetle legs vs cat legs come from very different body plans, eyebrows vs antennae are unrelated).