The period during prenatal development in which the developing organism is most susceptible or vulnerable to environmental intrusions is the period of the

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The period of the embryo is from approximately the 2nd week to the 8th week after conception. During this time, the developing organism is most susceptible to environmental intrusions, such as exposure to toxins or viruses, which can have significant impacts on its development. The ovum and zygote stages occur prior to the embryo stage and are less susceptible to environmental factors. The fetal stage occurs from the 9th week until birth, and while development still continues during this time, it is less vulnerable to environmental influences than during the embryonic stage.

The Period During Prenatal Development in Which the Developing Organism