Although we all have blood flowing through our bodies, not all blood is alike. The cause for this is, of course, evolution. Although we aren’t 100 percent sure of the evolutionary reason, it’s thought that different types of blood carry different advantages against different diseases.
For example, Type O blood is more prevalent in Africa and other parts of the world that have high instances of malaria. This suggests Type O carry some sort of advantage in the region: it seems cells infected with malaria don’t stick well to Type O blood cells.
On the other hand however, people with Type O may be more susceptible to other diseases. Research has yet to show conclusively why humans have different blood types. But as technology gets better, you can bet we’ll learn continue to learn more and more.
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