8. Although vaccines cannot be used to treat a person who is sick, they can help to prevent
infections. Vaccinations tell the body to create "memory cells", which will function later to create
antibodies against certain pathogens. When a person is vaccinated, what are they injected with?
(2 Points)
0
antibodies to a disease bacterium
O
blood from a person who has had the disease
weakened viruses/antigens from the virus
O
live, inactive virus

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 !