| 1. | Mass extinctions are relatively rare events; however, isolated extinctions are quite common.
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| 2. | A second, distinct mass extinction, the Hangenberg event, closed the Devonian period.
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| 3. | He is also interested in mass extinctions, especially the end Triassic event.
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| 4. | Two theories for past mass extinctions are meteor impacts and continent-size volcanoes.
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| 5. | But " the mass extinction is probably the responsibility of humans ."
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| 6. | Knoll has longstanding interests in biomineralization, paleobotany, plankton evolution, and mass extinction.
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| 7. | We are well into the sixth known mass extinction of life on Earth.
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| 8. | Some say this could cause a mass extinction worse than the K-T one.
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| 9. | Frogs have made it through drastic climate changes and mass extinction.
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| 10. | Scientists say the risk of mass extinctions has never been greater.
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