According to Freud, the Oedipus complex and the Electra complex represent the major

One strength of longitudinal studies is that investigators can

A) collect a large amount of data in a short time span. B) explore similarities among different aged participants at the same time. C) ensure that participants adequately represent the population of interest. D) examine relationships between early and later events and behaviors.

People who smoke are also more likely to drink excessively, and people who overeat usually do not get enough exercise. These observations illustrate that

a. many people have a disease-prone personality. b. genetics plays a strong role in one's addictions. c. unhealthy lifestyles almost always create multiple risks. d. the causes of poor health are coincidental and unpredictable.