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chemicals used as the propellants in aerosol sprays, as coolants in fridges, air conditioners and polystyrene, which damage ozone molecules in the ozone layer.
an organism that helps to spread a disease, but is not infected with the disease.
(also called secondary thickening) growth due to new cells being formed by the secondary...
the process whereby certain substances are removed from a liquid and others retained, due to...
tumours in the lung tissue that interfere with the normal functioning of the lungs.