Why is a systematic review/meta-analysis the highest level of evidence?

Please make sure your answers are conscise and in your own words. *DO NOT use citations or sources.
Why is a systematic review/meta-analysis the highest level of evidence?
Describe cohort study.
Give an example of a research question that best uses a cohort design.
Describe case control design.
Give an example of a research question that best uses a case control design.

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