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: 24

Answer

A blastula is a ball of cells that is hollow on the inside that develops from the fertilized egg.

Work Step by Step

A blastula is a ball of cells that is hollow on the inside. It is formed when the zygote undergoes many rounds of cell division. Along its development, the blastula will begin folding in on itself to form a tube that will eventually become the digestive tract.
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