I believe the best answer is horse and a zebra. This is because both Zebra and Horses share a common embryonic development in that their molecular and amino acids are almost identical . The study of one type of evidence of evolution is called embryology, which entails the study of embryos. Many traits of one type of animal appear in the embryo of another type of animal. For example fish embryos and human embryos both have gill slits. In fish they develop to gills while in human they disappear before birth.
