Which pairs of matter demonstrate the law of conservation?

* A structure made of building blocks
* The blocks of the same structure bundled in a pile

* A snowman
* The melted remains of the same snowman

* A lump of clay
* The same lump broken into three pieces

* 1 cup of water and one gram of salt, separated
* The same cup of water with one gram of salt mixed in

* A lump of clay
* An identical lump added to the original

* One apple
* The same apple cut into slices