Researchers in __________ analyze the relative effects of genes and environmental factors on behavior and mental processes

A study has found a positive correlation between smoking cigarettes and schizophrenia. What is a possible explanation for this finding?

a. Emotional problems experienced during childhood cause schizophrenia. b. Some property of nicotine could be part of the cause of schizophrenia. c. The gene that carries schizophrenia also increases the potential for smoking. d. A fourth variable could be causing both.

Two factors that universally interfere with family function in every nation are

ethnic differences and low income. low income and high conflict. high stress and high income. religious differences and low income.