During a prenatal class, a participant asks when the most critical period of fetal development occurs. Which of the following is the most appropriate response?
a. "The embryonic period, from the second to eighth week after conception."
b. "Immediately following implantation."
c. "During the zygotic phase after fertilization."
d. "From twenty to thirty weeks of gestation, when the organs are formed."
ANS: A
The embryonic period of development is when the basic organ structures are formed. During this time, teratogenic agents have the most damaging effects on the developing embryo.
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