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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.
a tough substance made from a modified polysaccharide that contains nitrogen. It is the main...
kidney failure which develops over a long period of time.
a v-shaped extension of the mammalian soft palate, which closes the opening to the nasal...
a ductless gland that secretes hormones directly into the bloodstream, to be transported to...