Some teratogens have a threshold effect, which means that they are _____.
A) harmful no matter what the level of exposure
B) rarely harmful
C) harmless until exposure reaches a certain level
D) always harmless

Question

Quizplus · Accepted Answer

Teratogens with a threshold effect means that they are harmless until exposure reaches a certain level. Below that level, there is no harm, but once the threshold is reached, harm can occur.

Some Teratogens Have a Threshold Effect, Which Means That They