Emil Kraepelin is best known for his contributions to the study of schizophrenia. He introduced two new diagnostic categories of disordered behavior - dementia praecox and manic-depressive insanity - based on symptom differentiation, , and .

the principles and empirical processes of discovery and demonstration considered characteristic of or necessary for scientific investigation, generally involving the observation of phenomena, the formulation of a hypothesis concerning the phenomena, experimentation to test the hypothesis, and development of a conclusion that confirms, rejects, or modifies the hypothesis.

yes, because even though a theory has a  lot of evidence to support it, it is not always true

answer; ///progressive relaxation;