Question

an electric heater warms a room because thermal energy flows from
regions to
regions.

Explanation:

Thermal energy (heat) naturally flows from regions of higher temperature to regions of lower temperature. An electric heater is a high - temperature region when it's operating, and the room initially is at a lower temperature (or at least has areas with lower temperature compared to the heater). So the first blank should be "higher - temperature" and the second blank should be "lower - temperature".

Answer:

First blank: higher - temperature; Second blank: lower - temperature