The classes of the Phylum Chordata are the Amphibia, the Reptilia, the Fish, the Birds, and the Mammalia. Amphibians include frogs, salamanders, toads, newts, and some less familiar animals, such as caecilians. ... Many Amphibians also have gills at some point in their life, but many lose them after their larvae stages.
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The classes of the Phylum Chordata are the Amphibia, the Reptilia, the Fish, the Birds, and the Mammalia. Amphibians include frogs, salamanders, toads, newts, and some less familiar animals, such as caecilians. ... Many Amphibians also have gills at some point in their life, but many lose them after their larvae stages.