The Forelimb of a Bat and the Forelimb of a Bird

Question

The forelimb of a bat and the forelimb of a bird are examples of ______ structures.
A) analogous
B) homologous
C) vestigial
D) homeotic
E) heterologous

Accepted Answer

The forelimb of a bat and the forelimb of a bird are both homologous structures, meaning they share a common evolutionary origin despite being adapted for different functions (flight in birds and echolocation in bats). This is evidenced by their similar bone structure and arrangement, as well as their development from similar embryonic tissues.