Answer
The correct option is (d)
Work Step by Step
In this experiment, the independent variable is time.
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 30, Digestive and Excretory Systems - Standardized Test Prep - Page 893: 8
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