What human activity is most responsible for the damage to the ozone layer?

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.

9. the history of life on earth is recorded in

How can an organ, such as the lungs, work for multiple body systems?