mahdiyai0078 mahdiyai0078

12-01-2018
Biology

contestada

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

Respuesta :

donasv77 donasv77

12-01-2018

white blood cells which forms the immune system

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