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Amphibians are cold blooded vertebrates. In the Devonian period of palaeozoic era they were originated from fishes, in the carboniferous period, they increased their number, hence that period is called ‘Age of amphibians’.
According to Romer Dipnoi fishes are the “uncles of Amphibians” According to Newman “Dipnoi and amphibians had same grand father.”
General Characters of Amphibians
Amphibians are cold blooded vertebrates which can hue on land and in water.
Amphibians show four limbs with which they can swim in water and jump or walk on the land, (But in apoda limbs are absent.)
In Amphibians animals exoskeleton is absent. But in apoda animals small cycloid scales are present.
In Amphibians the adult animals lungs are present. Gills are absent. But In some urodelans the gills are present.