Answer
(b) gastrulation
Work Step by Step
Gastrulation occurs during the third week, which is when the primary germ layers form.
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(3)
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