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The answer to the question stated above is letter D --- all blood types made compatible with each other

All blood types made compatible with each other was not a result of the 1898 discovery of the four blood types.

Answer;

-All blood types made compatible with each other

Explanation;

-In 1898, it was discovered that inherited differences in people’s red cells were the cause of many of the incompatibilities found with transfusions.

-During World War I, when human blood was needed for transfusions for wounded soldiers, studies began of how to preserve and transport blood and four blood types were identified.

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