Which of the following has a high risk of physical dependence, psychological dependence, and fatal overdose?

Some teratogens are harmless until they reach a certain level of exposure; they then become dangerous, thus demonstrating the

critical period effect. threshold effect. fetal teratogen effect. interaction effect.

When a pregnant woman ingests substances, the interaction of one substance with another often ______ the effects of one or both

decreases increases cancels The interaction has no impact.