What is a homologous structure?
A. A structure that only exist in the embryo
B. A structure that has no use in the organism
C. A structure with similar shape but a different use
D. A structure that is only in index fossils
The definition of a homologous structure is an organ or body part that appears in different animals and is similar in structure and location, but doesn't necessarily share the same purpose. An example of a homologous structure is the human arm as compared to the wing on a bird.
