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