All of the xanthines have similar effects. But which one has the greatest overall effect?

In bright light, visual acuity is greatest when the visual image falls on the

a. cornea. b. fovea. c. blind spot. d. periphery of the retina.

In response to Freud's assertion that women experience penis envy, Horney replied that

A) men also experience penis envy. B) women outgrow penis envy when they get married. C) men experience breast envy. D) men experience womb envy.