Which of the following statements is TRUE regarding the impact of teratogens?
A) Very few fetuses are exposed to teratogens, so it is easy to determine which teratogen causes which defect.
B) Fetuses are safe from the effects of teratogens during the first trimester.
C) Teratogens cause anatomical defects only after organogenesis is complete.
D) Exposure to teratogens does more damage when it occurs at some points in development than at others.

Question

Quizplus · Accepted Answer

Exposure to teratogens is most harmful during critical periods of development, such as during organogenesis in the first trimester, when major organs are forming.

Which of the Following Statements Is TRUE Regarding the Impact