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(SO2) a colourless gas that smells of rotten eggs or burnt matches and is produced by the burning of coal.
a complex chemical compound that fills the spaces in the cell wall between cellulose, ...
elongated cells in the xylem of vascular plants that transport water and mineral salts.
the process of removing salt and other minerals from seawater, to make it drinkable.
the protective layer of fibrous connective tissue which surrounds each kidney.