Cytotoxic t cells produce cytotoxins which cause apoptosis of infected cells. True or False

What are charcteristics of lithosphere?

How many major plates cover the earth

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.