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a complex chemical compound that fills the spaces in the cell wall between cellulose, hemicellulose, and pectin components, especially in tracheid, sclereid and other xylem cells. This makes the cell walls hard, woody and waterproof.
(also called renal failure) the condition in which the kidneys are no longer able to function...
the deposition or build-up of silt and organic matter on the beds of rivers, dams etc.
the excessive growth of algae in eutrophic streams, rivers and dams.
a clear, colourless solution of hydrogen chloride (HCl) in water. It is a strong and highly...