Certain flightless beetles have wings . their wings are an example of which type of structure ?
a. vestigial structure
b. embryonic structure
c. homologous structure
d. adapted structure

The correct answer is letter D. These beetles have an adapted structure. This refers to traits that they have inherited from their ancestors gene pool. Overtime the need and function for these structures are not needed by beetles in their overall survival, but the genetic code remains in their system which still gives birth to their wings that are not used anymore because of the new type of adaptation that they are going through.