What aspect of development is included in the embryonic stage of prenatal development

Question

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The embryonic stage of prenatal development includes the second through eighth weeks, during which the zygote implants into the uterine wall and undergoes rapid cell division and differentiation, forming the three germ layers and basic organs and structures. The formation of the zygote (A) occurs at fertilization, and implantation (B) occurs during the first week of development. The last seven months of the pregnancy (D) are part of the fetal stage.

What Aspect of Development Is Included in the Embryonic Stage