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Hello
your answer is B) in 4th and 7th line
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The three types of lymphocytes are T cells, B cells, and natural killer cells. The T cells destroy pathogens in a specific manner and activate B cells to produce antigen-specific antibodies. Phagocytes can be either macrophages, neutrophils, monocytes, dendritic cells or mast cells.
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Answer is D. White blood cells travel to the site to fight off infection.
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