The feathers of birds are derived from the scales of their __________ ancestors.
A)cartilaginous fish
B)bony fish
C)hagfish
D)reptilian
E)amphibian

Question

Quizplus · Accepted Answer

Feathers are derived from reptilian scales through a process called exaptation, where a structure originally used for one purpose (in this case, scales for protection) evolves into a new, advantageous trait (feathers for flight).

The Feathers of Birds Are Derived from the Scales of Their