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At About 21 Days, Two Ridges Appear in the Embryo

Question 45

Multiple Choice

At about 21 days, two ridges appear in the embryo and fold to make up the neural tube, which develops into the


A) nails, hair, and teeth.
B) digestive system, liver, and pancreas.
C) brain and spinal cord.
D) circulatory system, muscles, and skeleton.

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