In a smaller design, a few subjects are intensely analyzed

Regarding psychologists and the field of psychology, which of the following statements is/are TRUE?

a. Today, psychology is both a science and a profession. b. The field of psychology includes the study of love, death, aging, sexuality, emotion, happiness, and wisdom. c. Psychologists apply psychological principles to solve problems in fields, such as business, sports, law, and the design of machines. d. All of these statements are true.

Researchers created a mouse that is missing both copies of the Ob gene. This animal would be an example of:

a. a knock in. b. a knock out. c. a conditional knock out. d. a conditional knock in.