2) Paired fins rays of cartilage or bone
3) Jawed mouth terminal; most have many teeth
4) Respiration by gilll supported by bony gills arches convered by a common operculum
5) Swim bladder often present
6) 2 chambered hearts
7) Sexes serperate and fertilization is usually external
Page 2= Classification
Page 3= Adaptations
Page 4= Evolutionary History
Page 5= Milestones
Page 6= Bibliography