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Neporo4naja [7]
3 years ago
11

How do vaccinations work to keep patients healthy?

Health
2 answers:
sergey [27]3 years ago
6 0

Answer:

D) They introduce a weakened form of a disease so the body can learn how to fight it off.

BlackZzzverrR [31]3 years ago
6 0

Answer:

D

Explanation:

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