Case So Bad, Jury Excused From Service...
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No best answer has yet been selected by blackfive. Once a best answer has been selected, it will be shown here.
For more on marking an answer as the "Best Answer", please visit our FAQ.Regarding the connection with evolution, everything else about nature's physical make-up seems to be thus connected, so there's almost bound to be some such reason for blood-types, too, I'd guess.