Answer
D.
Work Step by Step
Natural selection acts on D, through which it may eventually alter C by changing the different frequencies of A found at the same B.
Campbell Biology (10th Edition)
by Jane B. Reece, Lisa A. Urry, Michael L. Cain, Steven A. Wasserman, Peter V. Minorsky, Robert B. Jackson
Published by
Pearson
ISBN 10:
0321775651
ISBN 13:
978-0-32177-565-8
Chapter 23 - Test Your Understanding - Level 1 - Knowledge/Comprehension - Page 499: 1
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