Who discovered the human ABO blood groups?
Answer
Karl Landsteiner
Landsteiner showed that blood from different people can react differently when mixed. Matching blood groups made transfusions far safer.
| Category | Inventions and Discoveries |
|---|---|
| Difficulty | Hard |
| Other options in the game | Alexander Fleming, Paul Ehrlich, William Harvey |
| Source | Encyclopaedia Britannica |
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