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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.
The first vertebrates to come onto land were fish-like animals that developed lungs and could thus stay on land for extended periods.These evolved into terrestrial amphibians â¦ (although many amphibians require water in which to lay eggs, and some are aquatic).+ 6 others found this useful.he group of  vertebrates that are terrestrial (land-dwelling) â¦ are called  tetrapods. The first tetrapods evolved in the late Devonian. They  were amphibious creatures that spent part of their lives in water.