<P> The Paleozoic was a time of dramatic geological , climatic , and evolutionary change . The Cambrian 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 , anapsids , synapsids , euryapsids , and diapsids 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 . Great forests of primitive plants covered the continents , many of which formed the coal beds of Europe and eastern North America . Towards the end of the era , large , sophisticated diapsids and synapsids were dominant and the first modern plants ( conifers ) appeared . </P>
<P> The Paleozoic was a time of dramatic geological , climatic , and evolutionary change . The Cambrian 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 , anapsids , synapsids , euryapsids , and diapsids 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 . Great forests of primitive plants covered the continents , many of which formed the coal beds of Europe and eastern North America . Towards the end of the era , large , sophisticated diapsids and synapsids were dominant and the first modern plants ( conifers ) appeared . </P>
diapsids dominated the terrestrial landscape for the first time following which event
diapsids dominated the terrestrial landscape for the first time following which event
the Cambrian explosion
the Cambrian explosion