3. The effects of cannabis on the developing infant are currently Select toxic Icon Key unclear harmful unequivocal
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Regarding prenatal teratogen exposure, which of the following statements is FALSE? 1. Exposure to teratogens during critical developmental periods will have more severe effects on the fetus. 2. Embryo lethality becomes more likely as the toxic dose is increased. 3. Major effects include growth retardation and malformations. 4. The immune system of the fetus is primitive, so the fetus has little to no ability to fight off chemicals and repair itself. 5. There is considered to be a toxin level threshold below which the fetus is capable of repairing itself.
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Tadpoles exposed to high doses of PCBs showed the most negative changes in health and survival associated with: A - increased gene expression B - decreased gene expression C - no change in gene expression D - none of the above Studies done on both humans and frogs that showed negative health effects from exposure to PCBs indicated: A - developmental stages are extremely sensitive to exposure to PCBs B - adult stages are the most sensitive to PCBs C - neither developmental stages nor adult stages are sensitive to PCB exposure D - none of the above Children exposed to PCBs in utero and during postnatal nursing compared to children exposed only in utero were: A - more prone to PCB-induced health effects B - less prone to PCB-induced health effects C - equivalently prone to PCB-induced health effects D - all of the above
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