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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...
supporting connective tissue found in the skeleton.
a group of organs that work together to perform a certain task.
(also called elimination or defecation) the process whereby undigested food remains are expelled...