Answer
b.
Work Step by Step
Option d. is incorrect. Living things can be the subjects of a controlled experiment.
Options a. and c. are incorrect, and option b. is correct. A controlled experiment manipulates only one variable at a 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 1, The Science of Biology - Assessment - 1.1 What is Science? - Understanding Key Concepts/Think Critically - Page 28: 5
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