Concept:Analogous structures perform similar functions but have different evolutionary origins. They best reveal differences in body design.
Explanation:A structure is called analogous when it carries out a similar function to another structure, but the two structures come from different ancestral origins.
For example, the wing of a bird and the wing of an insect both help in flying, yet they have completely different structural plans.
In analogous structures, the function is alike, but the underlying body parts are not constructed in the same way.
This shows that unrelated organisms can evolve separate structural designs to perform the same function.
Hence, analogous structures are significant in evolution because they demonstrate structural diversity rather than a common origin.
Answer:D. structural diversity