PREVIEW

... bilical cord.

During this process, the blood of the mother and the baby are not connected, but only serve as a carrier for delivering nutrients.

From the beginning of the division of the fertilized egg until it grows into an embryo, it mainly depends on the nutrients in the body and the parts provided by the uterus.

Until about four weeks after the fertilized egg develops, the umbilical cord begins to form, and the umbilical cord provides nutrition instead.

In this pr ...

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