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Which structures are part of the body's first line of defense against pathogens? A. white blood cells B. red blood cells C. lymph nodes D. mucous membranes
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Which structures are part of the body's first line of defense against pathogens?

A.
white blood cells







B.
red blood cells







C.
lymph nodes







D.
mucous membranes

User Tcbrazil
by
7.0k points

1 Answer

2 votes
white blood cells which forms the immune system
User Schadenn
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