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