Isaac wants to make s'mores. He holds a marshmallow on a metal skewer over a fire. A few seconds later, the marshmallow is cooked and the skewer feels warm. What most likely happened?

Thermal energy moves from the hotter fire to the cooler skewer and marshmallow. The skewer then transfers heat to the marshmallow, cooking it, and becomes warm itself. The fire-heated air may also contribute, but choice D best describes the transfer of heat from the fire to both objects.

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