Biology 2010 Student Edition

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

Chapter 25, Introduction to Animals - Standardized Test Prep - Page 749: 3

Answer

D

Work Step by Step

Option A is incorrect. The coelom is the body cavity that is lined with mesoderm. Option B is incorrect. The protostomes are the group of animals in which the first opening in the embryo later becomes the mouth of the animal. Option C is incorrect. Deuterostomes are the group of animals in which the first opening in the embryo becomes the anus and a secondary opening becomes the mouth. Option D is correct. The blastula develops after a number of cell divisions in the fertilized egg, or zygote.
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