Answer
a.
Work Step by Step
The number of arthropods that are known number at least a million species; this is about three times as much as the total of all other animal species added together.
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 26, Animal Evolution and Diversity - Assessment - 26.1 Invertebrate Evolution and Diversity - Understand Key Concepts/Think Critically - Page 776: 4
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