The largest mass extinction event occurred at the end of the _______ period, due at least in part to declines in the concentration of _______ in the atmosphere.

Name: The largest mass extinction event occurred at the end of the _______ period, due at least in part to declines in the concentration of _______ in the atmosphere.
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The Answer of The largest mass extinction event occurred at the end of the _______ period, due at least in part to declines in the concentration of _______ in the atmosphere.

The Largest Mass Extinction Event Occurred at the End of the _______