Which of the following sequence correctly orders the periods of prenatal development with respect to the potential impact of teratogens from least severe to most severe?
a) fetal period ? germinal period ? embryonic period
b) fetal period ? embryonic period ? germinal period
c) germinal period ? fetal period ? embryonic period
d) germinal period ? embryonic period ? fetal period
ANS: C, Teratogens have little if any impact during the germinal period. They have the most dramatic impact during the embryonic period.
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