Answer
b.
Work Step by Step
Most land vertebrates have four limbs. Many animals have four legs which are used as legs. Others, such as birds, have their two forelimbs adapted into wings. Primates such as humans have forelimbs adapted into arms.
Biology 2010 Student Edition
by Miller, Kenneth R.; Levine, Joseph S.
Published by
Prentice Hall
ISBN 10:
9780133669510
ISBN 13:
978-0-13366-951-0
Chapter 25, Introduction to Animals - Assessment - 25.2 Animal Body Plans and Evolution - Understand Key Concepts/Think Critically - Page 747: 21
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