Heart defects are especially common when pregnant mothers are exposed to a teratogen during which prenatal period?
A) the germinal period
B) the embryonic period
C) the fetal period
D) the last two weeks before birth

Question

Quizplus · Accepted Answer

The heart is typically susceptible to teratogens during weeks 3 to 5, which fall in the embryonic period (weeks 3-8).

Heart Defects Are Especially Common When Pregnant Mothers Are Exposed