As a general rule, the greatest vulnerability to _____ occurs during the _____ period of prenatal development.
A)teratogens; embryonic
B)epigenesis; embryonic
C)epigenesis; germinal
D)teratogens; germinal

Question

Quizplus · Accepted Answer

Teratogens, which are substances or conditions that can cause developmental abnormalities, have the greatest potential to affect the developing embryo during the embryonic period (weeks 3-8 of prenatal development). During this time, major organs and body systems are forming, and any interference or damage can result in serious developmental issues. The germinal period (weeks 1-2) is too early for teratogens to have a significant impact, and the epigenesis period refers to the process of genetic expression and is not related to vulnerability to teratogens.

As a General Rule, the Greatest Vulnerability to _____ Occurs