The Permian was a time of great changes. It was the last period of the Paleozoic Era. It lasted from 299 to 251 million years ago. After the Permian period life on earth was never the same. By the close of the Permian period, a mass extinction happened in which a large number of earth’s species became extinct. About 70 percent of all land dwelling vertebrate species were effected and approximately 90 percent of all marine invertebrates were obliterated. A few species survived the Permian mass extinction. According to the National Geographic Various theories seek to explain this mass extinction. Some scientists think a series of volcanic eruptions pumped so much debris into the atmosphere that the sun was blocked out, causing a significant drop
