Comparative anatomy shows that the bones in the leg of a horse, arm of a human, and wing of a bird have very similar structure. What part of the theory of evolution is supported by this evidence?
a
Animals evolved similar structures because they live in similar environments.
b
Animals evolved similar bone structure because they evolved at the same time.
c
Animals evolved similar structures to perform the same functions.
d
Animals evolved from a common ancestor with the same basic bone structure.
d
Animals evolved from a common ancestor with the same basic bone structure.