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Why are appellate courts usually made up of several judges?

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Wood-paneled courtroom with judge's bench, American and Nevada flags, wooden chairs and tables, and a mounted animal head above the bench in the Esmeralda County courthouse, Goldfield, Nevada. — Court Judge's bench in a courtroom in Nevada, U.S.

Appellate courts are typically structured as collegiate bodies consisting of several judges rather than a single judge to facilitate a more robust review process.1

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