Answer
A controlled experiment is when a hypothesis should be tested by an experiment in which only one variable is changed. All other variables should be kept unchanged, or controlled.
Work Step by Step
See above.
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 - Standardized Text Prep - Page 31: 9
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