How long ago are prokaryotes belived to have evolved on earth?

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

These are groups of reproducing populations that are insulated from other groups

Why is it important that each contour line represents the same amount of gain or loss in elevation