Which type of anatomic structure are bird wings and butterfly wings when compared to each other?
a. vestigial
b. homologous
c. analogous
d. heterologous

The correct answer is:

C. analogous

Explanation:

Analogous structures are these body structures in animals, which are used to perform related functions but which have a complex evolutionary history. They are also called connecting structures. These structures are made as a result of the need for the animals to adjust to alike environmental conditions. For situation, both bird and butterfly use their wings for gliding.

there are so many examples for that in different areas, like biology experiment carried out in our lab recently.

here's one link: