Biology 2010 Student Edition

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

Chapter 26, Animal Evolution and Diversity - Assessment - 26.2 Chordate Evolution and Diversity - Understand Key Concepts/Think Critically - Page 776: 14



Work Step by Step

Option a. is incorrect. The duckbill platypus lays eggs. They are in a specific group of mammals called monotremes. These mammals are not placentals. Options c. and d. are incorrect. The kangaroo and koala are members of another group of mammals called marsupials. The young are born in an extremely vulnerable state, completing their development within a pouch outside the mother's body. They are not placentals. Option b. is correct. Whales belong to the group of mammals called placentals.
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