Answer
D.
Work Step by Step
Some migration would increase gene flow (A), not decrease it (D). B and C cannot be evaluated with the information given, but are possible.
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 24 - Test Your Understanding - Level 3 - Synthesis/Evaluation - Page 518: 7
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