Biology (11th Edition)

Published by McGraw-Hill Education
ISBN 10: 1-25918-813-2
ISBN 13: 978-1-25918-813-8

Chapter 35 - Deuterostomes - Review Questions - Apply: 3

Answer

C.

Work Step by Step

Egg laying in primitive mammals is a retained, ancestral trait (C.), not something to place monotremes outside the mammals (A.). Nor is it a sign of parallel evolution (B.), since the mammals came from the egg-laying reptiles. D. is wrong since examples of both ectotherms and endotherms lay eggs.
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