While pregnant, Juana is exposed to a teratogen known to affect the heart of the developing organism.The effects will likely be most severe if the exposure occurred during the:

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The embryonic period (weeks 3-8 of pregnancy) is when the basic structures of the body are forming, including the heart. Exposure to teratogens during this period is likely to have the most severe effects on the developing heart.

While Pregnant, Juana Is Exposed to a Teratogen Known to Affect