Answer:
Step-by-step explanation:
A bill becomes law if signed by the President or if not signed within 10 days and Congress is in session. But if Congress adjourns before those 10 days and the President has not signed the bill then, the bill doesn't become a law.
If the president chooses to veto a bill, but normally in most cases Congress can vote to override the veto and the bill becomes a law. But if the president doesn't sign off on a bill and it remains unsigned when Congress is no longer in session, the bill will be vetoed by default.