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Vilka [71]
3 years ago
11

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

he __________ becomes the digestive system
Biology
1 answer:
den301095 [7]3 years ago
4 0

Weeks 3-4: three layers form: the ectoderm, the mesoderm, and the endoderm. Neural tube develops and produces neurons. Heart begins beating. Ribs, muscles, and digestive tract form. weeks 5-8: arms and legs develop, then fingers and toes; placenta and umbilical cord function; digestive system develops; liver produces blood cells. 

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