What is the main function of the immune system?
a. to recognize and attack disease-causing organisms

b. to stimulate the transmission of disease-fighting enzymes

c. to alert other systems in the body of foreign cells

d. to maintain a constant flow of blood to wounds

How did the discovery of the rhesus factor affect society? o more patients died from having a transfusion with the wrong rhesus factor 0 new treatments during pregnancy could prevent harm to the developing child. o less donated blood could be used in the treatment of patients. the number of blood types was reduced by half

The diagram shows the layers of earth. convection currents in which region influence the movement of tectonic plates

What drives an advertising campaign?