Всё к чему-то относиться. Напр. : Механика к Физике, Физика к Наукам. Как называется наука которая это изучает или как это в общем называется?​

Every person needs a friend - a person close to you in spirit , someone with whom to spend time wondering . Each - this is the man who will support you in sorrow and in joy , who will always try to help and advise .
    But all of us know how to make friends ? And in general - that is true friendship ? It so happens that two people are constantly talking, a lot of time together , but some of them might be trouble or joy, and a strong friendship is gone . About such people usually say that they do not stand the test . Some of them are scared of another trouble , did not want to intervene , worried ... And sometimes even worse - one friend began to envy the other: his successes , joys , victories ... No wonder they say that true friendship is not checked as much trouble as joy.