Answers:
1. The President can issue a veto to show he disagrees with a bill passed by Congress.
2. The Congress can bring the bill back and register a vote to overthrow the President's decision
3. The Supreme Court can strike down a law if they correctly claim it to be "unconstitutional"
4. Yes. Each branch of government can check and balance out the other to make sure no branch has too much power.
Step-by-step explanation:
Hope it helps!! :)