Answer
The extinction occurring at the end of the Permian resulted in the most number of genera becoming extinct.
Work Step by Step
The graph shows that the highest number of genera became extinct during the Permian Period.
Biology 2010 Student Edition
by Miller, Kenneth R.; Levine, Joseph S.
Published by
Prentice Hall
ISBN 10:
9780133669510
ISBN 13:
978-0-13366-951-0
Chapter 19, History of Life - 19.2 - Patterns and Processes of Evolution - Analyzing Data - Page 548: 2
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