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the destruction of the enamel of a tooth owing to the action of bacteria that live in plaque.
a very long time span in the Earth's history, covering tens or hundreds of millions of years....
consists of the pectoral and pelvic girdles together with the arms and legs.
the use of modern technology to manipulate living organisms to obtain products from them that...
animal wastes (particularly urine) that contain materials high in nitrogen.
the first part of the intestine, from the pyloric valve of the stomach to the caecum. It...