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a sticky film that forms on the enamel of teeth. It is made up of small food particles, saliva and the bacteria that convert food into acids.
the outermost layer of the stele or vascular cylinder in a dicotyledonous plant root. Lateral...
a black substance that coats the lungs of a smoker, causing cancer of the respiratory tract.
an atom or a group of atoms that has gained or lost one or more electrons and so has an electric...
the transfer of pollen from the anther to the stigma of the same plant (self-pollination) or of...