People in the New Stone Age had a different relationship
to plants and animals due
primarily to
a. climatic changes and
human innovations.
b. migration patterns.
c. religious beliefs and fire
control.
d. barbarian invasions.

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)