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If you have any questions, you are always welcome to contact us. We'll get back to you as soon as possible, withing 24 hours on weekdays.
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A comprehensive summary of current research and scientific thinking on the possible causes and mechanisms of largescale periodic extinctions. Topics include the fossil record of extinctions, modern extinctions, theoretical modelling of extinction events, the periodicity of mass extinctions, modern extinctions, and more. Touches on many speculations and controversies. The articles, originally presented at a Northern Arizona University symposium at Flagstaff in 1983, have been revised and updated.
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birth defects, or other reproductive harm.
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