Answer
Birds
Work Step by Step
Since the year 1500, nearly 130 bird species have become extinct, which is the highest number of extinctions of a group of organisms in that time span.
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 641: 3
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