| 21. | They were especially widespread globally in the aftermath of the Permian Triassic mass extinctions.
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| 22. | The loss of ozone could kill the food chain and probably cause mass extinctions,
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| 23. | All of the paleoseas experienced mass extinction of endemic species.
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| 24. | Others state that tropical rainforest deforestation is contributing to the ongoing Holocene mass extinction.
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| 25. | The Permian ended with the most destructive mass extinction in all of earths history.
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| 26. | The most brutal mass extinction was the one at the end of the Permian.
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| 27. | We are today in the midst of the greatest mass extinction in human history.
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| 28. | During the mass extinction ended the reign of the dinosaurs.
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| 29. | And Novacek tells him, " Mass extinction ( today ) is quite feasible ."
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| 30. | As such, birds were the only dinosaur lineage to survive the mass extinction event.
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