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an international agreement to phase out the use of CFCs, signed by 49 countries in Montreal, Canada, in 1987.
a clear, colourless, odourless and tasteless liquid that can also occur as a gas (water vapour)...
the thin moist surface across which gaseous exchange occurs.
blood that has no antibodies (blood group AB) and can receive any type of blood.
the spontaneous movement of molecules, atoms or ions, from an area of higher concentration to an...