The role of antibodies in the human body is to a. Stimulate pathogen reproduction to produce additional white blood cells
b. Increase the production of guard cells to defend against pathogens
c. Promote the production of antigens to stimulate an immune response
d. Recognize foreign antigens and mark them for destruction

Scientists are conducting a study on the effectiveness of a new drug on memory loss. they are giving some of the test subjects the new drug to find out if it improves their long-term memory. which are possible limitations of this study? check all that apply. a) test subjects may want to participate in additional experiments. b) test subjects may think they should be paid more. c) test subjects may get bored and want to quit early. d) test subjects may have to travel during the experiment. e) test subjects may have full-time jobs. this is multiple choice. you for the !