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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.
club moss, horsetails, and ferns that were common 300 mya. 12. In what era were mountains formed? Paleozoic Era 13. When Pangaea formed, what type of exTncTon occurred? and the largest mass exTncTon in history wiped out approximately 90% of all marine animal species. 14. In what period did dinosaurs and mammals appear? Mesozoic Era 15. In what period did the Rocky Mountains form? Mesozoic Era 16. How long ago did the Cenozoic period arise? 65 million years, and counTng (includes present Tme) 17. How did the Great Lakes form? Â±he Great Lakes form as ice melts 18. How long has there been a recorded human history?