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Amphibians originated from lobe-finned fish that lived in shallow freshwater during the Devonian period, around 416 million years ago. Some of these fish began crawling from pool to pool and spending time on land, leading to the class Amphibia. Amphibians have a mostly bony skeleton, four limbs, moist skin with glands, undergo metamorphosis from an aquatic larval stage to a terrestrial adult stage, and are cold-blooded with three-chambered hearts. They have been unsuccessful at fully colonizing land due to

Author

Muneeb Nazeem

Language

EN