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

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donasv77
donasv77 donasv77
  • 12-01-2018
white blood cells which forms the immune system
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