Environmental Science for AP* (2nd Edition)

Published by W. H. Freeman
ISBN 10: 1464108684
ISBN 13: 978-1-46410-868-6

Chapter 5 - Module 17 - Evolution of Niches and Species Distributions - AP Review Questions - Page 174: 4


C. 5

Work Step by Step

There have been theorized to be only 5 mass extinctions on planet earth. This answer can be found in the chapter 5 reading.
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