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  • Environmental influences affect the fetus.
    • Teratogens are environmental agents such as a drug, chemical, virus, or other factors that produce a birth defect.
  • There are several other prenatal environmental influences on the fetus.
    • What a mother eats during her pregnancy can have important implications for the health of her baby.
    • Several diseases, which have a relatively minor effect on the health of a mother, can have devastating consequences for the fetus.
    • Mothers who take drugs such as cocaine run the risk of giving birth to babies who are similarly addicted.
    • Alcohol and nicotine are dangerous to fetal development.







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