Neurons produce glial cells in a process called neurogenesis

In the Roll et al. study which was the main piece of research in the article Yoking Smoking about operant

conditioning, the independent variable was (a) brand of cigarettes smoked (b) abstinence (c) reward magnitude (d) amount of carbon monoxide exhaled

Men experience slower aging of the skin than women because

A) the dermis of men is thicker. B) men are more likely to wear sunscreen. C) the fatty layer of men's skin thickens, reducing elasticity. D) hormonal differences make women prone to age spots.