Question

describing thermal equilibrium
what occurs at thermal equilibrium?
heat flows from the higher - temperature substance to the lower - temperature substance
heat flows from the lower - temperature substance to the higher - temperature substance
heat does not flow because both substances are at the same temperature

Explanation:

Thermal equilibrium is a state where there is no net heat transfer. Heat transfer occurs due to a temperature difference. When two substances reach thermal equilibrium, their temperatures are equal. So, there is no driving force (temperature difference) for heat to flow.

Answer:

Heat does not flow because both substances are at the same temperature.