Biology (11th Edition)

Published by McGraw-Hill Education
ISBN 10: 1259188132
ISBN 13: 978-1-25918-813-8

Chapter 22 - The Origin of Species - Review Questions - Understand - Page 458: 5

Answer

A.

Work Step by Step

A. is true because both punctuated equilibrium and gradualism can be found in the biological world, while B. is wrong because it assumes one or the other is true always, which is easy to show to be false. C. is untrue since these might involve reproductive isolation, ut they are not part of it, while D. is wrong since A. is true.
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