4. which of the following statements correctly describes the role of white blood cells in the human immune system?
a. neutrophils gather at sites of infection and release histamine, while macrophages ingest antigens before they enter the bloodstream.
b. monocytes gather at sites of infection and release histamine, while basophils ingest antigens before they enter the bloodstream.
c. neutrophils gather at sites of infection and release histamine, while monocytes ingest antigens before they enter the bloodstream.
d. basophils gather at sites of infection and release histamine, while macrophages ingest antigens before they enter the bloodstream.
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