Harry Harlow completed a number of studies in which baby rhesus monkeys were raised with two artificial mothers. One of the mothers was made of wire and delivered food, while the other was made of cloth and provided no food. Harlow was interested in which of the mothers the infant monkeys would seek out when they were startled or frightened. In these studies the dependent variable was:

Historical vs today's presidents (compare)

Which of the following best illustrates the process of the supreme court’s review of a case?

Suppose you are a freshmen in college and you have not declared a major. one reason you enrolled at your respective college was the school's vibrant social life. at the same time, you want to balance your academic life because you know that your grades will matter for graduate school or job applications.you decide to forgo partying for two hours to study for an upcoming economics exam. in your first semester's principles of economics class, you learn that the enjoyment you would have received from partying is an example of a(n)