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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.
single-celled floating algae, which provide food for marine animals, such as fish and whales....
a serious and potentially fatal medical state caused by an allergic reaction, in which sufferers...
the outermost layer of the stele or vascular cylinder in a dicotyledonous plant root. Lateral...