What is a process that occurs when several smaller units work together?

What is the largest single preventable cause of premature death in the United States?

A) crack cocaine abuse B) cigarette smoking C) caffeine intoxication D) opiate exhilaration

The biopsychosocial perspective of abnormal behavior is also known as the ______ model

a. interactionist c. eclectic b. catharsis d. psychodynamic