Elephants and rhinos tolerate the small birds that ride their backs and eat insects on their skin. the relationship between the elephants and the birds is called

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