Answer
(a) cleavage
Work Step by Step
Cleavage causes the zygote to divide through mitosis, which at 72 hours has turned the zygote into a ball of cells or blastomeres that is called as a morula.
Human Anatomy & Physiology (9th Edition)
by Marieb, Elaine N.; Hoehn, Katja N.
Published by
Pearson
ISBN 10:
0321743261
ISBN 13:
978-0-32174-326-8
Chapter 28 - Pregnancy and Human Development - Review Questions - Page 1093: 1(1)
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