Which of the following provides the best comparison between reptiles and fish? a) they both have scales, but fish are ectothermic, and reptiles are endothermic . b) they are both ectothermic, but fish have gills, and reptiles have lungs. c) they are both vertebrates, but fish have three-chambered hearts, and reptiles have two-chambered hearts. d) they both lay eggs, but fish are invertebrates, and reptiles are vertebrates.