In research conducted since the introduction of sildenafil (Viagra), studies suggest that as many as _________ of men in the United States suffer from some degree of erectile dysfunction

Which of the following is a classic challenge of emerging adulthood?

a) needing to financially support oneself b) raising children c) getting along with a spouse d) taking on adult roles with ease

From a distance a "C" may appear to be an "O." This is an example of which Gestalt law?

a. Proximity b. Closure c. Good continuation d. Similarity e. Illusory contours