Biology 2010 Student Edition

Published by Prentice Hall
ISBN 10: 9780133669510
ISBN 13: 978-0-13366-951-0

Chapter 26, Animal Evolution and Diversity - Standardized Test Prep - Page 779: 11



Work Step by Step

Option A is incorrect. The backbone appeared after lampreys appeared; therefore, lampreys do not have this characteristic. Option B is incorrect. Four limbs appeared after the notochord appeared, not before. Option D is incorrect. The placenta appeared after mammary glands appeared. Option C is correct. Humans and lampreys shared a common ancestor because the two branches arose from a single broader clade.
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