How do vestigial structures serve as evidence to support the theory of
evolution through natural selection?
A. Similar structures in different species that have different functions
are the result of organisms adapting to similar environments.
B. Structures in different species that have similar functions show
that all organisms have a common ancestor.
C. Structures that have little or no function exist because an ancestor
once had a functional version.
D. Structures that are used infrequently become smaller and are not
passed on to offspring.