The Permian mass extinction occurred about 248 million years ago. It was the greatest mass extinction ever recorded in Earth's history. About ninety-five percent of all marine species became extinct as a result of the Permian extinction. Although scientific theories vary, it is believed that caused the Permian mass extinction. A)global warming)an asteroid hitting Earth)the introduction of dinosaurs)the start of glaciation and climatic changes

i actually have a suggestion instead of an answer, how about next time instead of spending the time to time up the question you take that time and try to figure something out for yourself, do you understand?

explanation:

leave a 5 star and a and brainliest answer if you understand, hope this betters you day, or not i don't really care either way. xd

there were 6 major base camps.   the base camps were located in alva, fort reno, fort sill, the madill provisional internment camp headquarters, mcalester and camp gruber.