comparative anatomy - COMPLETE

• • similarity in structure often suggest that species have a common ancestry
  • embryology - comparison of early stages
  • chicken and human have tail and slits and arches in neck akin to fish (gills)
  • homologous structure - similar structures used in different ways
  • forelimbs of vertebrates
  • vestigial structure - structures once important but either lost or changed
  • nictitating membrane covers eyes in various animals but does not for humans