The chart below shows three different stages of embryonic development for three different animal species. stages of development of three animal species the earliest stage in the chart appears very similar for all three species. for example, all three embryos at this stage have gill slits and a large embryonic tail. what do these similarities most likely indicate? a. all three species look very similar as adults. b. all three species evolved from a single mammalian ancestor. c. all three species share a distant common ancestor. d. all three species evolved in the past 100 years.