What distinguishes each element from all others, and gives it unique physical and chemical properties?

Which beat describes the brain stem

Which best explains how a heat pump can heat a room? cold air from the house is moved through pipes, where it absorbs thermal energy. warm air from outside is pushed into the house to replace the cold air. combustion warms the air when chemical energy is transferred to thermal energy. fuel is used to move a piston, which pushes warm air into the house.

Wich level of organization includes all the other levels or organizations