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Characterization of amphibians

Characterize amphibians in accordance to the examples of representing beings, skin, basic morphology, nitrogen waste, respiration, circulation, thermal control and types of reproduction?

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a) Examples of representing beings: toads, frogs, salamanders.

b) Basic morphology: eyelids, hydrodynamic larvae two pairs of limbs.

c) Skin: mucous glands, moist and permeable.

d) Respiration: cutaneous and pulmonary, branchial in larval stage.

e) Circulation:closed, incomplete, heart with three chambers without interventricular septum.

f) Nitrogen waste: urea.

g) Thermal control: heterothermic.

h) Types of reproduction: sexual, water dependant, external fecundation and aquatic larval stage.

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