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substances that have a harmful effect on the environment and also on human health.
(also called elimination or defecation) the process whereby undigested food remains are expelled...
a form of environmentally-friendly farming in which farmland and soil are cared for so that it...
an organic compound that always contains the elements carbon, hydrogen, oxygen and nitrogen and...
this muscle 'opens' or straightens the joint when it contracts (so the angle between the two...