Ok THE EASIEST QUESTION...
THE COMPOSITION OF HUMAN BLOOD IS ALMOST SAME FOR EACH SO..WHY HUMANS HAVE DIFFERENT BLOOD GROUP..
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Answer:
There is an evolutionary reason for having more than one blood type, and humans aren't the only species with such a trait. Our distant ancestors used to, but then mutations created different antigens on the outside of red blood cells, leading to the different blood groups.
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Blood types are inherited and represent genetic markers from both parents, so the answer to this question depends on the blood types of the parents. Each biological parent donates one of their two ABO alleles to their child. If both parents are Type A, for example, then their children must also all be Type A.
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