According to the image above, the four species share _______ structures which indicates that they all share a _______ ancestor.
Analysis of the embryonic structures for these four species would show _______ similarities for these vertebrates. The process of _______ provided the mechanism for these four species to become adapted to their specific
habitats over time.
Word bank: common, few, fossilized, genetic drift, high levels of, homologous, natural selection
