________ - Twelve jurors and at least one alternate are selected to hear the case

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This process ensures that there are enough people to hear the evidence presented and deliberate on the case, and also allows for the possibility of a juror becoming unable to serve during the trial.

what is it called

This process is called jury selection. During jury selection, potential jurors are questioned by both the prosecution and defense attorneys to ensure a fair and impartial jury is selected to hear the case.