What Is Your Blood Type?
Blood makes up around 7~8% of your body weight.
Your blood plays important roles in your body.
It carries oxygen around the body.
It is also an important part of your body’s immune system.
There is no substitute for human blood.
Blood types are commonly categorized into four groups: type O, type A, type B, and type AB.
The ABO blood group system was discovered by the Austrian scientist, Karl Landsteiner.
He identified the O, A, and B blood types in 1900.
He was awarded the Nobel Prize in 1930 for his work.
The fourth blood type, AB was discovered in 1902 by other Austrian scientists
