This is probably not a question you see, or probably the right subject for this but it is fine. So I got a Parakeet;Budgie 2 days ago, and he is chillin on my shoulder. But while he is on my shoulder he is cleaning him self. Does this mean he is getting comfortable with me?

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