Campbell Biology: Concepts & Connections (9th Edition)

Published by Pearson
ISBN 10: 0-13429-601-X
ISBN 13: 978-0-13429-601-2

Chapter 1 - Review - Page 18: 6

Answer

d.

Work Step by Step

In a controlled experiment, the experimental and control groups are compared with one another. Researchers manipulate a single variable in a controlled experiment; the two groups are essentially exactly the same except for the single variable the experiment is testing.
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