Biology 12th Edition

Published by McGraw-Hill Education
ISBN 10: 0078024269
ISBN 13: 978-0-07802-426-9

Chapter 42 - Animal Development and Aging - Assess - Page 814: 2

Answer

b.

Work Step by Step

The morula, a solid ball of cells, forms before the blastula. The morula forms as a result of cleavage. The blastula is also a ball of cells but is hollow on the inside.
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