Trevor watches as a freight train passes. he counts eight identical black railroad cars, then a red car, followed by several more black cars. which type of organic compound does the train most closely model?
a-an alkyl halide
b-an aldehyde
c-an ether
d-a carboxylic acid

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.