Which of the following best describes an example of a specific internal response to harmful bacteria? skin serves as a physical barrier that prevents bacteria from entering the body. saliva contains enzymes that destroy bacteria and prevent infection. bacterial infection causes the release of histamine, which leads to inflammation and swelling. antigens trigger the production of antibodies, which mark bacteria 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 !