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Biology Notes on Amphibians
Frogs, toads, salamanders, and newts are direct descendants from fish. Amphibians evolved from a type of lobe-finned fish. The name amphibian is from the Greek amphi, which means "double," and bios, which means "life." The name is appropriate because of the fact that they can live in water, as well as on land. Fossil evidence indicates that amphibians evolved from lobe-finned fishes about 370 million years ago. Recent analysis of the DNA of coelacanths and lungfishes indicates lungfishes are in fact far more closely related to amphibians than are coelacanths.
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