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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.
Before vertebrate animals adapted to specific terrestrial habitats, such as deserts, they first had to adapt to living on land. The primary adaptations to life on land occurred in the Paleozoic 400 to 360 mya (million years ago) with the evolution of amphibians.he evolutionary radiations of modern amphibians and reptiles, as well as of modern mammals and birds, began as the dinosaurs declined in the late Cretaceous (98-65 mya).