Biology 2010 Student Edition

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

Chapter 32, Skeletal, Muscular, and Integumentary Systems - Standardized Test Prep - Page 945: 8



Work Step by Step

Option B is incorrect. Melanin gives skin its color. Option C is incorrect. Fat is what insulates the body. Option D is incorrect. Keratin is what makes nails and hair hard. Option A is correct. Sebum is made in the sebaceous glands and keeps the skin and hair moist and waterproof.
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