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blood that has no antigens (blood group O) and can be given to a person with any blood group.
simple epithelium with flattened cells found in the inner lining of the mouth, oesophagus and...
an abnormal response of the immune system to the protein in certain foods.
any disease that is caused by a virus or a bacterium or any other micro-organism.
(also called homeostatic control) the self-regulation and maintenance of a constant stable...