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Amphibians are vertebrates that breathe through lungs and thin, moist skin. They have a three-chambered heart and double-loop circulatory system that is more efficient than the single-loop system of fish. Amphibians go through a metamorphosis where tadpoles with tails and gills transform into adults without tails that use lungs to breathe on land. There are three main groups of amphibians: frogs and toads, salamanders, and caecilians.Read less