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Why do we Have Different Blood Types?

Feb 24, 2016 by

A, AB, B, O? What’s the difference? And why can’t someone with type A blood give to type B blood? Watch the video below to find out.

https://youtube.com/watch?v=MYMZrMQXqI4%3Frel%3D0%26showinfo%3D0%2520frameborder%3D0%2520allowfullscreen