Biology 2010 Student Edition

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: 18



Work Step by Step

Option a. is incorrect. Fertilization is the process by which two haploid gametes unite to form a single diploid cell called a zygote. Option c. is incorrect. Symmetry is how the parts of the body are distributed along an axis. Option d. is incorrect. Multicellularity is the term used to describe an organism made of more than one cell. Option b. is correct. Cephalization is the congregation of nerve cells and sensory organs at the anterior portion of an organism.
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