Biology 2010 Student Edition

Published by Prentice Hall
ISBN 10: 9780133669510
ISBN 13: 978-0-13366-951-0

Chapter 4, Ecosystems and Communities - Assessment - 4.4 Biomes - Understand Key Concepts/Think Critically - Page 125: 21



Work Step by Step

The tundra region is characterized by a layer of soil called permafrost that lies below the top layer of soil. This layer remains completely frozen from year to year.
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