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Characterization of class Reptilia

How class Reptilia characterized according to illustrations of representing beings, fundamental morphology, skin, circulation, respiration, nitrogen waste, thermal control and kinds of reproduction?

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Illustrations of representing beings: snakes, crocodiles, turtles, lizards, dinosaurs (extinct/vanished). Fundamental morphology: tetrapods, a few with carapaces (such as turtles). Skin: impermeable and keratinized, corneous plates (termed as scales). Respiration: pulmonary. Circulation: closed, in-complete, heart with three chambers and partly interventricular septation. Nitrogen waste: uric acid. Thermal control: heterothermic. Kinds of reproduction: sexual, internal fecundation and shelled eggs with extra embryonic membranes.

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