bewellplus.gsu.edu
Buchinski882 Buchinski882
  • 14-03-2014
  • Biology
Answered

A vaccine

Acan be harmful because it contains pathogens such as viruses.
Bcontains a changed pathogen, so the pathogen is no longer harmful.
Cprovokes a response from the viral immune system.
Dall of the above

Verified Answer :

Daryn Daryn
  • 15-03-2014

It's B, ijust read my biology book

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