Which is the best hypothesis to use for this investigation

Avariable that is not being directly tested during an experiment should be

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.

Use the periodic table to complete this equation that represents nuclear fission processesun - ba c 3 n