What does heat flow between objects stop?
when both objects have low temperature
when both objects have high temperature
heat flow does not stop
when both objects have the same temperature

answer:

when both object have the same temperature

warm front forms when a moist, warm air mass slides up and over a cold air mass. as the warm air mass rises, it condenses into a broad area of clouds. a warm front brings gentle rain or light snow, followed by warmer, milder weather.

hope i !