2. Copy everything on this slide Extensive glaciation at the beginning that fades due to global warming Great diversity of amphibians and early reptiles Therapsids were common (mammal-like reptiles) Greatest diversity of insects of all time Seed plants became more dominant The seas contained, ammonoids (nautilus), bony fish, and large reef communities The period ends with the largest mass extinction in the past 600 million years Paleozoic Era Permian Period 299-252 mya

4. Synapsids