A teratogen is a harmful agent or substance that can cause malformations or defects in an embryo or fetus.
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Q67: Assuming that a newborn infant is normal,
Q68: The fetal period of prenatal development lasts
Q69: Helga is in her fifth month of
Q70: Excessive drinking during pregnancy can cause fetal
Q71: Stem cells are long, threadlike structures composed
Q73: As the neural tube expands during development,
Q74: The newborn infant is equipped with reflexes
Q75: Examples of teratogens include alcohol, cocaine, heroin,
Q76: By the fourth month of prenatal development,
Q77: Some teratogens, such as cocaine, cigarette smoke,
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