If one body is positively charged and another one is negatively charged free electrons tend to ?

Two metal blocks that have slightly different temperatures are placed next to one another. after five minutes, they both have lower but equal temperatures. according to the law of conservation of energy, what  most likelyhappened? energy was created inside the blocks.energy was destroyed inside the blocks.energy was absorbed into the blocks from outside the system.energy was transferred from the warmer block to the cooler block.

Give more examples of this type of heat transfer:

#20 which type of bond is formed when bases pair in dna? ionic bond covalent bond coordinate bond hydrogen bond