During which event are the primary germ layers formed?

A. Conception
B. Implantation
C. Gastrulation
D. Cleavage
E. Organogenesis


Answer: C

Anatomy & Physiology

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Fill in the blank(s) with correct word

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The lumen of a hollow organ such as the stomach is considered to be part of the ________ environment.

A) external B) internal

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Which of the following forms the fetal portion of the placenta?

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