Final answer:
In the American legal system, the grand jury hears all evidence that is presented by the prosecutor, who represents the government and tries to prove the accused's guilt.
Step-by-step explanation:
The grand jury is an important part of the American legal system and is responsible for determining whether there is enough evidence to charge someone with a crime. In this process, the grand jury shall hear all evidence presented by the prosecutor.
The prosecutor is the representative of the government whose responsibility is to present evidence and argue that the accused person is guilty of a crime. The defense attorney, judge, and witnesses all play roles in the trial, but it is the prosecutor who presents evidence to the grand jury.