1. When a microorganism enters our body, it produces…
2. What contributes to the weakening of the immune system?
3. which cells help to destroy bacteria in our body?
4. Is it necessary to produce a large amount of an antidote before the death of the body occurs?
5. After getting sick, will our body remember this virus in order to avoid re-infection?
6. What will our body do when we get a toxin?
7. What are vaccines used for?
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