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The Cambrian Period witnessed the most rapid and widespread diversification of life in Earth's history, known as the Cambrian explosion, in which most modern phyla first appeared. Fish, arthropods, amphibians, reptiles, and synapsids all evolved during the Paleozoic. Life began in the ocean but eventually transitioned onto land, and by the late Paleozoic, it was dominated by various forms of organisms.
Amphibians are vertebrate animals residing in a wide range of habitats, such as aquatic, terrestrial, and arboreal. Evolution of the earliest amphibians took place in the Devonian period; their features modified over a period of time. While some are extinct, following are the characteristics of the extant species of class Amphibia. Â» The color of the skin of amphibians is a result of three layers of cells called chromatophores. 1  Deepest layer is made up of melanophores. 2  Intermediate layer consists of guanophores giving the organism the blue-green color.  Topmost layer consists of lipophores, which give the yellow color to the organisms.