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.
Biology 12th Edition
by Mader, Sylvia; Windelspecht, Michael
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
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