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Answer: observational study
Explanation:
The observational studies are those studies where the researchers observes the samples or individuals of research without any intervention or manipulation.
In epidemiology, and nutritional studies the researcher observes the risk factors associated with the disease, diagnosis and treatment. The effect of a diet on the patient or volunteers can be done through observational studies.
Answer:
Masks haven't impacted schools, however social distancing has, as there's only so many people that can fit within one classroom, therefore most schools have switched to a hybrid schedule, making it so that people have to go to school at different times.
Explanation: