My electric bills for June, July, and August last summer were $75, $75, and $150, respectively. What was the mean amount for the three bills?

Which of the following is a possible culprit of "morning sickness"?

a) increased minute respiration b) decreased intestinal peristalsis c) decreased aldosterone secretion d) increased blood volume

The opponent-process theory of color vision describes:

a. how ganglion cells code color information. b. the way cones respond to different colors. c. the way rods respond to different colors. d how color processing in the fovea is coded differently than in the periphery.