John has inherited a personality trait that makes him more likely to keep to himself than to socialize. As a result, he does not have many friends and spends a lot of time alone. If John were to develop depression, the model that would probably best explain this situation and the cause of his depression is:.1. Diathesis-stress2. Biological3. Interpersonal4. Reciprocal gene environment

Martha participates in a research study in order to receive extra credit for her psychology class. when she arrives in the research office she is given a can of what looks and tastes like beer, but which actually contains no alcohol. in the adjoining room martha's classmate karen is also participating in the study. karen receives a can of alcoholic beer. if the experiment was designed to test the effects of alcohol on concentration, then who is exposed to the independent variable?