Answer
Eras are made up of periods.
Work Step by Step
For example, the Paleozoic Era is made up of six periods.
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 - 19.1 - The Fossil Record - 19.1 Assessment - Page 545: 3a
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