Which of the following is the greatest known mass extinction to date?
A) K-Pg
B) Permian
C) Triassic
D) Devonian

Question

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The Permian mass extinction, also known as "The Great Dying," is the greatest known extinction event to date, with an estimated 95% of all marine species and 70% of terrestrial vertebrate species going extinct. This event occurred approximately 252 million years ago. The K-Pg extinction (choice A) occurred around 66 million years ago and resulted in the extinction of non-avian dinosaurs, but is not considered as severe as the Permian extinction. The Triassic (choice C) and Devonian (choice D) extinctions were also significant events, but did not result in as drastic a loss of biodiversity as the Permian extinction.

Which of the Following Is the Greatest Known Mass Extinction