No, it's still constitutional to select jurors. In fact, most legal scholars consider them essential to fulfilling the Sixth Amendment right to a jury trial.
No
(Supreme Court)
It is not unconstitutional. The Supreme Court ruled that it is constitutional.
How many jurors are empaneled is determined by each jurisdiction, there is no 'national' answer and I cant give you a specific without knowing which Supreme Court you are referring to.
It allowed the Supreme Court to overrule an unconstitutional law.
the supreme court can declare laws unconstitutional
Declared unconstitutional by the supreme court
The Supreme Court gained the power to declare laws unconstitutional
They can appeal to the United States Supreme Court to have the law be declared unconstitutional by the Supreme Court's right to judicial review.
the supreme court can declare laws unconstitutional
the supreme court can declare laws unconstitutional
The name given to the Supreme Court's power to declare a law unconstitutional is judicial review.