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is one-millionth of a metre or one-thousandth of a millimetre (0,001 mm). Its unit symbol in the International System of Units (SI) is µm.
the trapping of the sun's heat energy by certain gases in the atmosphere, e.g. carbon dioxide...
a small finger-like blind-ending extension of the mammalian large intestine connected to the...
reactions in which large complex molecules are broken down to form smaller,simpler molecules;...