Amphibians have smooth moist skin and their young have tails and gills but the adults have lungs and legs. Amphibians are ectothermic
Fish have gills. There are 3 different kinds of fish: Cartilaginous fish, Jawless fish, and Bony fish. Cartilaginous fish have smooth skin and dermal teeth. Bony fish have a swim bladder that helps them control depth. Jawless fish do not have jaws, just a round sucker mouth with teeth along the edges. All fish are ectothermic.
Mammals give birth to live young, give milk to their young, and have fur or hair. They are endothermic.
Birds are oviparous which means they lay hard shelled eggs. They have an air sac around their lungs to help them fly, have hollow bones, are endothermic, and have feathers.
Reptiles have rough, dry, scaly skin and are ectothermic. They lay leathery eggs and the 4 orders are Testudines, Crocodilian, Snakes, and Lizards.