To state that a particular teratogen has an effect during a "critical period" means that it:
A) can affect organ systems that are critical for sustaining life
B) can cause the mother to become critically ill and perhaps die
C) exerts its effect on development only during a particular stage of development
D) will require the mother to be hospitalized, most likely in a critical care unit

Question

Quizplus · Accepted Answer

Critical period refers to the period of development during which the effect of a teratogen occurs. A teratogen is a toxic agent of any kind (including chemicals) that potentially causes abnormalities in the developing child.

To State That a Particular Teratogen Has an Effect During