Paleozoic Era: Permian Period
By: Gretta Goertzen
During the Permian Period the deserts that are in the tropical areas became larger. Also the supercontinent Pangaea forms causing severe extremes of its climate and environment because of its huge size. The extinctions in the Permian Period is estimated to have wiped out more than 90 percent of all marine species and 70 percent of land animals. These rapid extremes of conditions may have meant species were unable to adjust.