Question

an unanswered constitutional question about the judicial branch involves
who should approve judges and justices.
what “good behavior” means, with regard to judicial terms.
how a supreme court is created.
who should appoint judges and justices.

Explanation:

The Constitution states that federal judges and justices serve for life on "good behavior", but it doesn't define what "good behavior" means in judicial - terms. The appointment of judges and justices by the President and approval by the Senate are clearly outlined. The creation of the Supreme Court is also provided for in the Constitution.

Answer:

what “good behavior” means, with regard to judicial terms.