AP BIOLOGY

Detailed explanation-1: -Evidence of an evolutionary common ancestor is seen in the similarity of embryos in markedly different species. Darwin used the science of embryology to support his conclusions. Embryos and the development of embryos of various species within a class are similar even if their adult forms look nothing alike.

Detailed explanation-2: -Comparative embryology is the comparison of embryo development across species. All embryos pass from single cells to multi-celled zygotes, clumps of cells called morulas, and hollow balls of cells called blastulas, before they differentiate, creating the organs and systems of the body.

Detailed explanation-3: -Comparative embryology is the study of the similarities and differences in the embryos of different species. Similarities in embryos are likely to be evidence of common ancestry. All vertebrate embryos, for example, have gill slits and tails.

Detailed explanation-4: -Similar anatomy across different species highlights their common origin and can be seen in homologous and vestigial structures. Embryology provides evidence for evolution since the embryonic forms of divergent groups are extremely similar.