Name: Period: Evidence of Evolution Background



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2) Embryology

Organisms that are closely related may also have physical similarities before they are even born! Take a look at the six different embryos below:





Source: http://www.starlarvae.org

These are older, more developed embryos from the same organisms.




These are embryos at their most advanced stage, shortly before birth.




  1. Look again at the six embryos in their earliest stages. What physical similarities exist between each of the embryos? (name at least 3)



  1. The human embryo was letter F. Which organism’s embryo(s) became different from the human embryo the earliest in development?



  1. What does this say about the relatedness of this(ese) organism(s) and humans?



  1. Which organism’s embryo(s) where the same as the human embryo the longest in development?



  1. What does this say about the relatedness of this organism and humans?


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