Answer:
A harvest sown and reaped on the same day In an unplowed field, Which increases without growing, Remains whole though it is eaten Within and without, Is useless and yet The staple of nations.
What is the smallest bridge in the world?
It is a sound of empty, speak and it'll talk back plenty. But all the more you yack, you'll get the same words back.
There is someone, and there is always another, for without the other, there wouldn't be one
What has two spines and a lot of ribs, and carries much but never moves?
They are many and one, they wave and they drum, Used to cover a state, they go with you everywhere.