Question just about blood: Being their are different types?

what is the "oldest" blood type and why is it labled the oldest? Also is there anything to show that say like one blood type come from one group of people or anything like that?

I know strange question but it be a weird thought that came to mind.

Thank you.
Answers:
Here are some articles on it that should answer your questions.

http://www.lisashea.com/lisabase/biology…

http://www.stepstoperfecthealth.co.uk/ar… Source(s): RN

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