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a foreign substance, usually a protein, that stimulates the production of one or more antibodies. The foreign substance, which could be a virus, bacterium or toxin, can be from the external environment or from within the body.
unicellular organisms that do not have a proper nucleus or membrane bound organelles.
the process whereby water and small molecules dissolved in the blood are forced out of the...
(also called elimination or defecation) the process whereby undigested food remains are expelled...