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Identify something in the bloodstream of the mother that can NOT cross the placenta. Which primary germ layer will become the
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Answer #1

1. Many microbes do not cross placenta. Microbes.

2. Endoderm form digestive and respiratory systems.Ciliated epithelial cells are formed by endoderm. Endoderm.

3. On the 14th day because on this day only the egg is released from the ovary in to the fallopian tubes where fertlization occurs to form zygote 14th day.

4. The cellular layer is coronaradiata layer which surrounds the secondary oocyte. The cells are granulosa cells.

5. The process of formation of nervous system occuring in 4th week is called neurulation. Neural tube is formed in the process.

Neurulation.

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