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Characteristics (Fish (Paired fins, External fertilization, Vertebral…

- - - - scales keep reptiles from drying out
      - some shed, like snakes
    - - respiratory system
        
        more oxygen = more energy release can be releases through metabolic reactions and more complex movements
        
        lungs have large surface area
        
        use lungs for gas exchange
      - circulatory system
        
        4 chambered heart
        
        have 2 separated atria and 1 partially separated ventricle
    - - amnion: membrane that surrounds developing embryo
      - leathery shell: protects embryo and internal fluids
      - covered with protective shell, has internal membranes