Answers ?? And explanation needed now ty

Stereotypes can influence the way we think about a specific group of people. this is especially common in racial and ethnic group, but it is not reserved specifically for those groups. stereotypes can also apply to school groups, cliques, and neighborhoods. a stereotype is similar to which of the following terms: a)feature detectors b)texture gradient c)perceptual set d)stereogram e)relative clarity

10. in 2009, roughly of people age 12 or older who did not drink alcohol were current users of illegal drugs. a. 4% b. 10% c. 13% d. 20%

How was the structure of american society different in 1848 than it has been in 1800