Question

hi guys
please give me answer fast​

Answer 1

Answer:

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• Human Body mechanism may have threats from outside Since there are many threats like pathogens like viruses and Bacterias which will Make life without ease. So to prevent and eradicate these pathogens we apply vaccines which act on Them and Weakness the pathogens.

Answer 2

Answer:

A vaccine activates our immune system without making us sick. Many dangerous infectious diseases can be prevented in this simple and effective way.