A primary immune response ________, and a secondary immune response ________.
A. produces antibodies within five to ten days of exposure to antigens; produces antibodies within a day or two of a subsequent exposure to the same antigen
B. occurs only in children; occurs only in adults
C. is very rapid in producing antibodies after exposure to antigens; is very slow in producing antibodies after exposure to antigens
D. is very important; is less important to the body's ability to protect itself
Answer: A
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