uzzi1353 uzzi1353
  • 15-06-2022
  • Biology
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Certain preparations contain killed or weakened live biological agents that, upon injection into our body, protect the body against those pathogens. what are these preparations called? a. vaccines b. enzymes c. t cells

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meooow7729
meooow7729 meooow7729
  • 16-06-2022
The answer is A: vaccines
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