A vaccine works by training the immune system to recognize and combat pathogens, either viruses or bacteria.
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Ok this might not be the best answer but just by reading it, it may be unreliable because numbers do change over time
Homeostasis is the stable internal condition of a cell. It what keeps you healthy. Homeostasis happens in the cell membrane so it it were damage, you would have trouble maintaing homeostasis, which could lead to illness, then DEATH
