At 18 months Jarrod realizes that he can ask his mother to give him a cookie, and that his mother will behave under her own power to respond to his request, this is when Jarrod comes to see his mother as a(n) .

When were criminals first used to create a system to catch other criminals

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)

An refers to a specific factor that has a range of possible values