Answer
75 percent
Work Step by Step
Major extinction events are characterized as a loss of at least 75 percent of all species within a period of 2 million years.
Environmental Science for AP* (2nd Edition)
by Friedland, Andrew J.; Relyea, Rick
Published by
W. H. Freeman
ISBN 10:
1464108684
ISBN 13:
978-1-46410-868-6
Chapter 18 - Module 59 - The Sixth Mass Extinction - AP Review Questions - Page 640: 1
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