Which of the Following Mass Extinction Events Is Correct

question 52

Multiple Choice

Which of the following mass extinction events is correct?

• A)During the Permian period,over 90% of the species disappeared due to an excess of carbon dioxide in the atmosphere.
• B)At the end of the Ordovician period,over 90% of the species went extinct due to a meterorite impacting the Earth's surface and causing a cloud of ash to reduce solar exposure for several weeks.
• C)At the end of the Cretaceous period,over 90% of the species went extinct due to a meteorite impacting the Earth's surface and causing a cloud of ash to reduce solar exposure for several weeks.
• D)At the end of the Devonian period,70% of the terrestrial vertebrates went extinct when Gondwana drifted back towards the South Pole.

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