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This huge mass extinction was marked by an intense ice age, causing the sea level to fall. Marine organisms were the dominant form of life and this resulted to about 85% of them to die off.

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Two sharp pulses of death occurred and global cooling most likely is the cause of this extinction. The massive drop of temperatures affected marine life and plants.

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The main theory of this extinction is massive volcanism. Which was at the Siberian Traps, the size of Australia.

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The biggest theory as to the cause of this mass extinction was also massive volcanic eruptions. This time in the “Central Atlantic magmatic province”,the size of Canada.

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The most recent mass extinction is rumored to be caused by an asteroid or comet impact because some research suggests this theory.