Answers

2015-09-22T16:13:17+08:00
Karl Landsteiner is an Austrian Scientist who identified the O, A, and B blood types in 1900.

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2015-09-25T13:12:41+08:00
Karl Landsteiner
- is the one who discovered the four main types of blood, these are O, A, and B blood types, he is a Austrian Scientist. 
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