It has been demonstrated that those who were prenatally exposed to the influenza virus are more likely to develop schizophrenia. In other words, prenatal exposure to the influenza virus is ________ correlated with developing schizophrenia

Which of the following brain structures connects the two cerebral hemispheres?

A) corpus callosum B) glial cells C) reticular formation D) cerebellum

In research, extraneous variables are problematic because they threaten a study's

a. internal validity. b. external validity. c. reliability. d. potential for making a profit.