Answers:
1) The congress has two houses, the Senate and the House of Representatives. They vote on which laws should be accepted as a suggestive law before being sent to the president to sign.
2) The president can approve the law or veto the law. By vetoing a bill, he/she would not sign the bill.
3) This should be true. Justices have their seat for life, unless they are removed or impeached.
