In one study on the effect of argan oil on wrinkles, 125 subjects who acknowledged being long-time argan oil users had their wrinkles compared with those of 125 people who had never used argan oil. In a second study, 75 subjects were randomly chosen to use argan oil and 75 were chosen to use a placebo. Identify the types of studies performed. The first study was a controlled experiment, whereas the second was an observational study. The first study was an observational study, whereas the second was a controlled experiment. Both studies were controlled experiments. Both studies were observational studies