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Answer: A - Heat can be transferred by conduction, convection, and radiation. Heat is always transferred from a hot medium to a cold medium in equal amounts. That is, what the hot medium loses in the transfer is the same amount the cold medium gains in the transfer. Conduction, convection, and radiation are modes of heat transfer. Conduction involves the movement of molecules during the transfer. Convection involves mixing mediums. Radiation involves electromagnetic principles to transfer heat.