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Characterizations of amphibians

Write the characterizations of amphibians 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: frogs, toads and salamanders. Fundamental morphology: two pairs of limbs, hydrodynamic larvae and eyelids. Skin: permeable and moist, mucous glands. Respiration: pulmonary and cutaneous, branchial in larval phase. Circulation: closed, in-complete, heart with three chambers with no inter-ventricular septum. Nitrogen waste: urea. Thermal control: heterothermic. Kinds of reproduction: sexual, external fecundation, water dependant, and aquatic larval phase.

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