Does every new beginning come from some other beginning's end?

That's how the human centipede worked, yes 🤔

indeed and alas. it's nearing closing time.

Maybe not every single one, but most do indeed.

According to Semisonic, yes.

Including the universe?

Some do. Some beginnings start from mid points as well. A new beginning could spawn some other beginning shortly after or even at the same time as itself.