Biology 2010 Student Edition

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: 3b

Answer

The Silurian Period began 444 million years ago. It lasted about 28 million years.

Work Step by Step

From the diagram, we can see that this period started about 444 million years ago. It lasted from 444 million years ago to 416 million years ago. To get the length of this period, we subtract 416 from 444 to get 28 million years.
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