Biology, 22.07.2019 18:00 kimsash05

A(n) is an injection of weakened or dead viruses or bacteria, or pieces of proteins from weakened or dead viruses or bacteria. it is given to the immune system of people "learn" how to defeat the real virus or bacteria. a) antibiotic b) antibody c) pathogen d) vaccine

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A(n) is an injection of weakened or dead viruses or bacteria, or pieces of proteins from weakened o...