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