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a species that helps scientists identify the age of sedimentary rocks.
tumours in the lung tissue that interfere with the normal functioning of the lungs.
irreversible disease where the alveoli are damaged, resulting in breathing difficulties.
the cone-shaped region of the renal medulla, made up of the loops of Henlé and the collecting...
pollutant gases such as nitrogen monoxide and nitrogen dioxide. They are produced during ...
the space in the middle of the tooth which contains cells, blood vessels and a nerve.