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The Cambrian Period witnessed the most rapid and widespread diversification of life in Earth's history, known as the Cambrian explosion, in which most modern phyla first appeared. Fish, arthropods, amphibians, reptiles, and synapsids all evolved during the Paleozoic. Life began in the ocean but eventually transitioned onto land, and by the late Paleozoic, it was dominated by various forms of organisms.
Amphibian Adaptations. For amphibians, limbs and lungs were two of the most important adaptations as the former helped them move around without having to depend on the buoyancy of water, and latter replaced the gills to facilitate respiration.volution of Amphibians. Amphibians were the first vertebrates to adapt to the terrestrial life; something which occurred somewhere around 400-360 million years ago. The first major group of amphibians to evolve on the planet was armed with fins-which were quite similar to legs that helped them crawl out of the water.