SCIENCE, school subject, FEELING, emotion, BACTERIA, tiny living thing, REGULARLY, again and again, IMMUNE, protected, HEALTHY, strong and good, BENEFITS, positive effects, BADLY, in a negative way, SLEEP, night, VIRUSES, can cause illness, SYMPTOMS, sick, BRAIN, thoughts and memory, TEENAGE, child, adult, EMOTION, a feeling, DIET, kind of food, STRESS, pressure.

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