The results from a recent study suggest that the cognitive perspective surpassed the behavioral perspective in influence sometime around

What is a category of byproduct that is produced in the body and has been related to aging?

a) Carbon dioxide b) Oxygen-deprived ribonucleic acid c) Acetylcholine d) Free radical

Drugs that may cross the placental barrier and harm an embryo/fetus include

a. illegal drugs (heroin, cocaine) b. prescription drugs c. "over the counter" drugs (aspirin, antihistamines) d. all of the above