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simple inorganic chemical substances (mineral salts) that are needed in very small amounts for normal growth and development of a living organism.
the total amount of carbon dioxide produced by individuals, nations or organisations as a result...
(also called macromolecules) large, more complex molecules formed when monomers join together....
a large domain of prokaryotic micro-organisms. They are typically a few micrometres in length...
the windpipe or tube that carries air. It is kept open by C-shaped rings of cartilage.