was the biggest
extinction we know of.
While there are mass extinctions in the end of many geological time
periods, no other one has wiped out so many species.
The Permian mass extinction happened in the end of the Permian Period,
about 250 million years ago.
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It particularly affected marine animals, and also terrestrical
plant eaters. More than 90% of marine, and about 70% of terrestrial
extinct. It is also the only known mass extinction that included
Plants were less vurnerable than animals. It is not known what caused
it, but there are many different theories about global warming, gas
fires and coal explosions, and volcanism.
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