Why is blood-typing important and how is mixing incompatible blood types dangerous?

Mixing incompatible blood quickly creates a sea of red dumplings swimming in yellowish liquid, bringing on instantaneous death.

In 1900 Dr. Karl Landsteiner discovered the A, B, and 0 blood groups and demonstrated that blood could be successfully mixed within the same group.

He named the differences the “Rh factor.”

why is blood typing important and how is mixing incompatible blood types dangerous
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