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It would depend on the legislation of the country you are referring to. A prosecution service, a grand jury, a magistrate, the police.
A jury doesn't decide that, a District Attorney usually decides that.Another View: In some jurisdictions you would be referring to a Grand Jury.
The person on the jury is a juror.
The 7th Amendment to the U.S. Constitution gives U.S. citizens the right to a trial by a jury of their peers. Jury service is supposed to provide a person being tried with a jury of their peers.
After the case is over and the judge has discharged the jury.
It can depend upon your state statututes. Ignoring a jury summons is ignoring a court summons.
Are you asking about a scheduling problem? If your community service conflicts with jury duty, you should speak with the organizer of the community service and request that your time slot be moved. You cannot ignore a jury duty summons.
jury is a body of a person
(in the US) as long as a person is a citizen of the country they are eligtible for jury service regardless of their racial or ethnic background.
a person of a jury picked by the jury or the judge
a person of a jury picked by the jury or the judge
The thirteenth amendment