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an atom or a group of atoms that has gained or lost one or more electrons and so has an electric charge.
organisms whose cells have a true nucleus and true organelles. These structures are not...
rain that contains high levels of sulfuric acid, hydrochloric acid and nitric acid.
anaerobic respiration that occurs in plants and results in the formation of ethanol and carbon...
involuntary muscle found in the walls of blood vessels, in digestive, respiratory, urinary and...