Which of the following statements is true of prenatal development in humans?

A) The beginnings of organs appear during the embryonic period.
B) The rate of cell differentiation decreases during the embryonic period.
C) The intestinal tract first appears in the fetal period of prenatal development.
D) The fetal period refers to the first and second week of conception.

Question

Jaliyah Langford · Accepted Answer

Final Answer : A, Explanation :  During the embryonic period, which lasts from the second week to the eighth week after conception, the beginnings of organs appear as cells differentiate and migrate to form structures such as the neural tube, heart, and limb buds.Option B is incorrect because cell differentiation actually increases during the embryonic period as primitive stem cells differentiate into specialized cell types.Option C is incorrect because the intestinal tract actually appears in the embryonic period as part of the developing digestive system.Option D is incorrect because the fetal period starts from the ninth week after conception and lasts until birth.

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