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they acquire oxygen from water and lack limbs, to a four-legged, air-breathing adult form adapted for living on the land. there are about six thousand distinct living species of amphibians. examples include frogs , toads, salamanders , newts, mudpuppies, and caecilians . a highly diverse group of animals
, but some amphibians utilize gills as well. occupying habitats in most parts of the world, amphibians play an important role in the balance of nature. they exemplify bi-level functionality as they consume a significant amount of insects and other invertebrates, and are themselves prey for larger animals...
https://www.newworldencyclopedia.org/entry/Amphibian