Why Do We Have Different Blood Types?

There are a number of different blood types that a person can have, but what's the difference between them all? Get 15% off http://www.domain.com's domain names and web hosting when you...

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I get asked all the time what my type is. A negative. What? It’s way more important, what if I need a blood transfusion? Hey blood brothers and sisters, Julian here for DNews. Even if you don’t know your blood type you’ve probably heard the terms thrown around before. AB positive. O negative. What do they mean? It turns out there are actually 33 different systems for categorizing a person’s blood, but the nomenclature you’re most familiar with is a combination of two of them; the ABO system and the Rh system. The reason these two are so much more well known is because they are by and large the most important factors in blood transfusions. In most cases these alone should be enough for a doctor to know what kind of blood to pump back into you if you’...
Why Do We Have Different Blood Types?
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