v9ens8tepheberrelF v9ens8tepheberrelF
  • 01-03-2017
  • Biology
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Which of the following provides a first line of defense against pathogens?

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Аноним Аноним
  • 03-03-2017
The first line of defense against disease is intact skin and mucous membranes. If an antigen (pathogen) cannot enter the body, a secondary defense is unnecessary.
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