The "strange situation" is an experiment designed to measure________

A store plays background music on some days, randomly chosen, and none on other days. It compares sales on the two kinds of days. What is the independent variable in this experiment?

a. The workers in the store b. The volume of sales c. The presence or absence of music d. The variations in weather

The high protein intake of a low carbohydrate diet may increase feelings of ____, which could account for its ____

a. euphoria, success c. depression, failure b. satiation, success d. bloatedness, failure