G) The objects must be different temperatures
The way that heat transfer works is that the warmer object transfers energy to the colder one in order to reach equilibrium
The particles are locked in space. they are compactly arranged.
If the bill is counterfeit and the paper is wood-based, the iodine in the pen solution will react with the starch and leave a dark brown or black mark.
The difference is really simple, it's basically whether it's an plant or animal
