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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.
can be broken down, in a reasonable amount of time, into its base compounds by micro-organisms...
hormone produced by the pancreas, which catalyses the conversion of glycogen to glucose.
elongated cells in the xylem of vascular plants that transport water and mineral salts.
a serious and potentially fatal medical state caused by an allergic reaction, in which sufferers...
dormant, tough and non-reproductive structure that remains dormant until conditions become...