Nicotine is no more harmful than caffeine

According to the World Health Organization, what percentage of children worldwide has diets that are deficient in protein?

a. 10% b. 25% c. 50% d. 75%

In an experiment on the relationship between anxiety and eating behavior, some participants are induced to experience high anxiety and some participants are induced to experience low anxiety. The amount of food they eat is then measured

What is the independent variable in this study? a) amount of food eaten b) number of participants c) level of induced anxiety d) the participants' weight