An engineer is building an electronic device. she wants to use a material that will give her the most control over the amount of electric charge that flows through a circuit. which material should she use?
a tube
a insulator
a semiconductor
a conductor

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