Which of the following is a characteristic of the third line of defense that makes it significantly different from the second line?
A. The response is specific to a single antigen.
B. The initial response is very rapid, beginning in minutes to a couple of hours.
C. The response is effective on a broad range of antigens.
D. The response to a second exposure is similar to the response to a first exposure.
E. The responding cells are a variety of cell types.
Answer: A
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a. true b. false