Where does the friction oppose motion on a roller coaster car

Which of the following statements is true about women and minorities in early psychology? a. in the early 20th century, numerous graduate schools recruited women and minorities to study psychology. b. opportunities in higher education were limited for women and minorities in the early 20th century due to discrimination. c. despite some obstacles, there were numerous employment opportunities for women and minorities. d. women and minorities were often selected to do academic research in an effort to make the field more diverse.

Select the correct answer. what does the process of natural selection involve?

Use 4 to 5 complete sentences, explain the concepts of beats and how beats are produces.