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During the Germinal period of prenatal development, the placenta must achieve implantation.

This is further explained below.

What is a Germinal period?

Generally, There are three primary phases that occur throughout the processes of development in the womb.

The first two weeks of application of a new are referred to as the germ cells stage, the third week thru the eighth week has been known as the embryonic phase, as well as the period from the ninth week until delivery is known as the fetal stage. 

In conclusion, During the stage of fetal development known as the Germinal period, the placenta is attempting to become implanted.

Read more about the Germinal period

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