Environmental Science for AP* (2nd Edition)

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


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.
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