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Rasek [7]
3 years ago
11

Once your body is accustomed to a _______, the real version has a much harder time replicating itself in your system. A. vaccine

B. parasite C. pathogen D. bacterium
Biology
1 answer:
rjkz [21]3 years ago
3 0
The answer is A, a vaccine. This is why they are often given to children for prevention.
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