Which of the following statements is true about 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 does more damage at certain critical periods in development. The timing of exposure is crucial as it can affect different stages of fetal development differently. Therefore, option D is the correct statement. Option A is incorrect as many fetuses are exposed to teratogens, making it difficult to determine which teratogen causes which defect. Option B is incorrect as fetuses can be affected by teratogens during any trimester of pregnancy. Option C is incorrect as teratogens can cause anatomical defects at any stage of development, not just after organogenesis is complete.

Which of the Following Statements Is True About the Impact