what is blood?how many types of blood?name them and discribe it .
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Human blood is grouped into four types: A, B, AB, and O. Each letter refers to a kind of antigen, or protein, on the surface of red blood cells.
RBC: it carries oxygen and other materials from the heart to parts of body.
WBC:it protects us from the disease causing bacteria.
PLATELETS: it helps us to clot our blood when we get a cut or a wound.