Answer
d.
Work Step by Step
Plant type and light intensity variables can be kept constant. Thus, the correct answer is option D.
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 22, Introduction to Plants - Standardized Test Prep - Page 661: 8
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