Opiates have hypnotic effects, which means they can:

The search for individual genes related to intelligence has led to what result, so far?

a. No genes influence intelligence. b. One gene has been found that leads to "genius" level intelligence. c. Three genes control most of the variation in intelligence. d. Intelligence relates to many genes with small effects.

When following the scientific method, psychologists usually begin a study by:

A) formulating a research question. B) testing a hypothesis. C) calculating correlations. D) modifying theories.