Answer
A.
Work Step by Step
The cork cambium (A.) forms the layers of the bark, which is part of secondary, not primary, growth.
Biology (11th Edition)
by Raven, Peter; Johnson, George; Mason, Kenneth; Losos, Jonathan; Singer, Susan
Published by
McGraw-Hill Education
ISBN 10:
1259188132
ISBN 13:
978-1-25918-813-8
Chapter 41 - Plant Reproduction - Review Questions - Understand - Page 862: 11
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