It is during the fetal period that

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During the fetal period (9th week to birth), most of the internal organs are prepared for full functioning, including the respiratory, digestive, and urinary systems. Brain structures are not completely formed until after birth. While the developing organism is sensitive to damaging environmental factors during this period, it is most vulnerable during the embryonic period (weeks 3-8). There is no evidence that growth of the reproductive system stops during the fetal period.

It Is During the Fetal Period That