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the very cold zone in an ocean, dam or a lake, located below the range of effective light penetration (the limnetic zone).
(also called selectively permeable membrane) a membrane which allows some substances to cross it...
ground tissue with thin-walled cells that makes up most of the plant body. These cells are used...
a hard granule of crystallised minerals which forms in the kidney.
pollutant gases such as nitrogen monoxide and nitrogen dioxide. They are produced during ...