Answer
B.
Work Step by Step
A fits inside B, and hybrids are rarely possible at the level of C. D is itself a product of gene flow, not a unit which participates in that process.
Campbell Biology (12th Edition)
by Jane B. Reece, Lisa A. Urry, Michael L. Cain, Steven A. Wasserman, Peter V. Minorsky
Published by
Pearson
ISBN 10:
0135188741
ISBN 13:
978-0-13518-874-3
Chapter 24 - Test Your Understanding - Levels 1-2 - Remembering/Understanding - Page 524: 1
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