Examples of teratogens include alcohol, cocaine, heroin, and industrial chemicals such as PCBs and mercury.
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Q70: Excessive drinking during pregnancy can cause fetal
Q71: Stem cells are long, threadlike structures composed
Q72: A teratogen is a harmful agent or
Q73: As the neural tube expands during development,
Q74: The newborn infant is equipped with reflexes
Q76: By the fourth month of prenatal development,
Q77: Some teratogens, such as cocaine, cigarette smoke,
Q78: The fetal brain is constantly changing, forming
Q79: Stem cells can divide indefinitely, renew themselves,
Q80: By the third week after conception, a
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