Biology: The Unity and Diversity of Life (14th Edition)

Published by Brooks/Cole Publishing Co.
ISBN 10: 1305073959
ISBN 13: 978-1-30507-395-1

Chapter 25 - Self-Quiz - Page 433: 10

Answer

c. keratin

Work Step by Step

Birds have feathers covering their bodies whereas mammals have hair. Both hair and feathers are composed of keratin, a protein. Feathers and hair are structures that help keep animals such as birds and mammals warm.
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