Finding out your blood type is actually pretty easy. All you need are 3 test tubes with 3 different reagents containing 3 different antibodies: A, B, and Rh. And a sample of blood, of course. Drop some blood into each test tube and watch for the contents to clump. Clumping means the blood is reacting with the same antibodies it has in itself and that’s how scientists figure out our blood type.
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