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an international agreement to phase out the use of CFCs, signed by 49 countries in Montreal, Canada, in 1987.
pollutant gases such as nitrogen monoxide and nitrogen dioxide. They are produced during ...
any disease that is caused by a virus or a bacterium or any other micro-organism.
the sequence of events relating to the flow of blood or blood pressure in the heart that occurs...
to change over a period of time in response to new environmental conditions.
meristem that produces a layer of bark on the outer surface of a plant.