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 are substances, such as drugs, alcohol or viruses, that can cause birth defects or malformations in the developing fetus. The embryonic period is the second period of prenatal development, lasting from 2 to 8 weeks after fertilization, during which the most critical structures and systems of the body form. The developing organism is most susceptible to the harmful effects of teratogens during this period, which makes it the greatest vulnerability to teratogens.

As a General Rule, the Greatest Vulnerability to _____ Occurs