Answer
a. the presence of live yeast
Work Step by Step
The independent variable is the presence of live yeast. Thus, the correct answer is option A.
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 21, Protists and Fungi - Standardized Test Prep - Page 631: 8
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