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: 9



Work Step by Step

In examining the cladogram, we look at the characteristic that arose before any of those species arose. Option A is incorrect. The placenta arose right before the evolution of humans. Option C is incorrect. Four limbs evolved after the appearance of the trout. Option D is incorrect. Mammary glands appeared right before the appearance of the wallaby and human. Option B is correct. The notochord appeared before the appearance of the trout, wallaby, and human; this means that these species share this characteristic.
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