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During the period of the embryo, the __________ becomes the nervous system, the __________ becomes the circulatory system, and the __________ becomes the digestive system.

A) ectoderm; mesoderm; endoderm
B) ectoderm; endoderm; mesoderm
C) mesoderm; ectoderm; endoderm
D) endoderm; ectoderm; mesoderm

Marked as best answer by Amaly


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