how are differences between bills resolved by the house and senate?

Answer 1

Bills are debated upon both by the House and Senate. If there are disagreements, the bill is subjected to a vote with at least 2/3 of the members voting separately to make the bill become a law.

Answer 2

If the House and the Senate pass two versions of the same bill, that bill goes to a Conference Committee, which is made up of the members of the House and Senate committees under which the bill originated. (If this was a tax, it would be the House Ways and Means committee and the Senate Ways and Means committee.) The conference committee would work out the differences, produce a single version of the bill, then both the House and the Senate would have to vote to approve the compromise bill.

Answer 3

They gradually modify their bills to match each other by long periods of negotiation until they get both houses and enough Representatives and Senators from their respective house to pass the bill.