Biology 2010 Student Edition

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

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.
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