All of the following would be questions that could be scientifically investigated except:
1. will equal sizes of styrofoam and wood have the same mass?
2. does lack of sunlight affect plant growth?
3. what is the proper number of children to have in today's family?
4. does adding salt to water raise its boiling point?

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.

Which one of the following research methods can show cause and effect

Each neuron shown in this figure innervates a group of muscle fibers. what is the term for a group of muscle fibers innervated by a single neuron?