Can someone help me with this given hypothesis to a question? (scientific method): Hypothesis: aboveground environment influences belowground microbial community structures.

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