Why Do We Have Different Blood Types?

Published on Mar 19, 2015
477,043 views
Life Noggin
Why Do We Have Different Blood Types?

Why do humans have all kinds of different blood types? What is A, B, AB and O all about?

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Sources:
http://www.redcrossblood.org/learn-ab...
http://www.ncbi.nlm.nih.gov/books/NBK...
http://www.ncbi.nlm.nih.gov/books/NBK...

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