Reference groups refer to a. the relatively permanent, homogeneous divisions in a society that consists of people who share similar values, interests, and behaviors. b. individuals who exert direct or indirect social influence over others. c. people to whom an individual looks as a basis for self-appraisal or as a source of personal standards. d. those buyers who, through the size of their purchases, affect where marketing dollars will be spent. e. those with whom a person does not wish to be a member of or identified.

The answer is letter C, people to whom an individual looks as a basis for self-appraisal or as a source of personal standards.

Explanation: A reference group is a comparative, like brothers, parents. Are people or superheros, a group of individuals that it can be compared with yourself. How you want to be, these group represent people that is admired by you.

the boundarys like convergent divergent and transform it causes subduction

the correct answer is the following is a list of inventions made in the medieval islamic world, especially during the "islamic golden age" (8th to 13th centuries),[1][2] as well as the late medieval period, especially in the emirate of granada and the ottoman empire.

science and technology in the islamic world adopted and preserved knowledge and technologies from contemporary and earlier civilizations, including persia, india, china, and greece-roman antiquity, while making a number of improvements and innovations.