The first system to classify blood types is known as which of the following? a-s-r system b-d-g system a-b-o system c-o-v system

The first system to classify blood types is the A-B-O system

It was discovered by Austrian scientist Karl Leindsteiner in 1900.

In this system, the bloods is classified into 4 Groups : A , B , AB , and O according to anti plasma and antigen that they contain

Blood transfusions were rarely done and often fatal; they were outlawed until the nineteenth century.