John likes hiking he observes that whenever he hikes up a hill he breathe heavier than when he is on flat ground which two statements explain why this happened

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.