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Description
First truly terrestrial vertebrates; ectothermic; tough, dry and scaly skin (keratin) that are impermeable to water and periodically shed
Dermals
Contain chromatophores (color changing cells)
Breathing and Skull
Thoracic (negative pressure); better jaws, muscles, teeth; kinetic skull
Internal Factors
Copulatory organ and internal fertilization; kidneys excrete uric acid