Answer
D.
Work Step by Step
A-C could all lead to allopatric speciation, but gene flow (D) would stop or greatly slow that process.
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 2 - Application/Analysis - Page 517: 5
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