A)amphibians have smooth non-scaly skin,whereas reptiles are covered with scales and their skin is dry.
B)all reptiles respire by the use of lungs,while amphibians use small lungs supplemented by cutaneous respiration.
C)amphibian eggs are laid in water,but reptiles do not require water for reproduction.
D)reptiles are ectothermic,while amphibians are endothermic.

A)Ectotherms that have a bony skeleton.
B)Ectotherms that have a smooth nonscaly skin.
C)Endotherms that have a smooth nonscaly skin.
D)Vertebrates that have scales and are ectothermic.

A)The evolution of jaws from the gill slits that would enable them to bite more efficiently.
B)The evolution of an ectothermic lifestyle so they could regulate their body temperature based upon the environment.
C)Gills that would increase the efficiency of their breathing.
D)A cartilaginous endoskeleton that would provide for more power while swimming.
E)A skin that is nonscaly that also allows for an increased respiration ability.