what is blood ? and how many types of blood define them....
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Blood cells constantly die and your body makes new ones. Red blood cells live about 120 days, and platelets live about 6 days. Some white blood cells live less than a day, but others live much longer. There are four blood types: A, B, AB, or O. Also, blood is either Rh-positive or Rh-negative.
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1
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it is like water it has power to help human being or animals body to move.
it is of 6types
a+
a-
b+
b-
o+
o-
I am sorry i am not able to define their types
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