With the exception of a few frog species that lay eggs on land, all amphibians begin life as completely aquatic larvae. ... As amphibian larvae develop, the gills (and in frogs, the tail fin) degenerate, paired lungs develop, and the metamorphosing larvae begin making excursions to the water surface to take air breaths.
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With the exception of a few frog species that lay eggs on land, all amphibians begin life as completely aquatic larvae. ... As amphibian larvae develop, the gills (and in frogs, the tail fin) degenerate, paired lungs develop, and the metamorphosing larvae begin making excursions to the water surface to take air breaths.
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