I heard that South America has a way to make oil from coal...
If the manipulation of the independent variable causes a change in the dependent variable, covariance is established.
Answer:
because some people have different viewpoints like most people like quiet places people enjoy this because they can catch there thoughts they dont have to hear people talking over them. or like loud places i know some people who like loud nosises because its like a race with them. you can think of orchestra for example most people play in an orchestra because the music is calming and you can relax
Explanation:
