Changes

*[[Blood]] with [[Erythrocyte|red blood cells]] containing [[hemoglobin]], and [[Leukocyte|white blood cells]]  

*[[Blood]] with [[Erythrocyte|red blood cells]] containing [[hemoglobin]], and [[Leukocyte|white blood cells]]  

* A well developed body cavity (''coelom'') containing visceral systems  

* A well developed body cavity (''coelom'') containing visceral systems  

*Paired [[kidney]s with ducts to drain waste to exterior  

*Paired [[kidney]]s with ducts to drain waste to exterior  

*Most vertebrates have two distinct sexes, each with paired [[gonad]]s, although there are some exceptions

*Most vertebrates have two distinct sexes, each with paired [[gonad]]s, although there are some exceptions

*A general body plan consisting of head, trunk, two pairs of appendages, and postanal tail (but these structures are highly modified in many vertebrates and sometimes absent).<ref>Myers, P. 2001. "Vertebrata" [http://animaldiversity.ummz.umich.edu/site/accounts/information/Vertebrata.html Animal Diversity Web] Accessed June 20, 2007</ref>

*A general body plan consisting of head, trunk, two pairs of appendages, and postanal tail (but these structures are highly modified in many vertebrates and sometimes absent).<ref>Myers, P. 2001. "Vertebrata" [http://animaldiversity.ummz.umich.edu/site/accounts/information/Vertebrata.html Animal Diversity Web] Accessed June 20, 2007</ref>