Thinking in evolutionary terms, why would differing blood types occur in humans?
Death inducing diseases affecting specific blood types appear to be rare.
Since blood types are not outwardly apparent, there seems to be no reproductive benefit of one type over the other.
If longevity and reproduction seem to be unaffected by blood type, then what could have been some of the causes that effected the evolution of human blood types over time?
Evolution is a fact, look at the different physical aspects of people, that is evolution.
Evolution? Is that girl power?