Multiple Choice
An embryo's ectoderm, one of the three layers of the embryonic disk formed during the germinal stage, later becomes
A) the excretory and circulatory systems.
B) the sensory organs and nervous system.
C) the muscles and skeleton.
D) the digestive system, liver, salivary glands, and respiratory system.
Correct Answer:
Verified
Correct Answer:
Verified
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