With computerized tomography scans (CT scans), recording electrodes are attached to the scalp to measure global changes in the electrical potentials of brain cells

The first environment in which genes begin functioning is

a. different cell types. b. a single cell. c. the womb. d. a variety of chemicals.

A recent study reports that students who just finished playing a prosocial video game were more likely to help others than students who had played a neutral or antisocial game. For this study, what is the independent variable?

a. The students who were given the prosocial game b. The students who were given the neutral or antisocial game c. The kind of game given to the students d. The helping behavior of the students