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 (11th Edition)
by Jane B. Reece, Lisa A. Urry, Michael L. Cain, Steven A. Wasserman, Peter V. Minorsky
Published by
Pearson
ISBN 10:
0-13409-341-0
ISBN 13:
978-0-13409-341-3
Chapter 23 - Test Your Understanding - Level 1 - Knowledge/Comprehension - Page 503: 1
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