Scientists classify the proteins found on the surface of red blood cells into groups called . which include, type A, type B, type AB, and type O.

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.

Select the correct answer from each drop-down menu proteins are

Agroup of organisms that changes over time is said to