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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 ...
(also called polymers) large, more complex molecules formed when monomers join together.
compounds that consist of any combination of elements, but do not usually contain carbon and...
in plants: the first plant to become established in an area.in plants: the first plant to become...
a v-shaped extension of the mammalian soft palate, which closes the opening to the nasal...