Uncovering Evidence of a 6th Mass Extinction

Nature World: New fossil evidence is pointing to the possibility of a sixth mass extinction event in Earth's past, and this one may have helped usher in the largest "great dying" that that ever occurred. If that is right, the Permian period may have actually been hit with a two-punch knockout that caused more species loss than the infamous extinction of the dinosaurs. New fossil evidence is pointing to the possibility of a sixth mass extinction event in Earth's past, and this one may have helped usher in the......

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