Blood Types is the classification of blood. What makes blood red is the red blood cells, that carry oxygen, suspened in plasma. If we didnt have red blood cells our blood would be yellow. Other things in our blood include platlets, platlets clot to form a scap, and there are also white blood cells to fight off infections.
There are four main blood types, A, B, AB and O. When you get put into blood groups, your either a positive or negetive. Scientist can tell who you are as DNA exsits in your white blood cells. There are fewer White Blood Cells in your blood than Red Blood Cells. The majoirity of the world is O+.
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