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a black substance that coats the lungs of a smoker, causing cancer of the respiratory tract.
this muscle 'opens' or straightens the joint when it contracts (so the angle between the two...
single-celled algae that have two flagella and are found mainly in seawater but are also common...
a molecule that accelerates (speeds up) a chemical reaction, by lowering its activation energy,...
those species that are found only in a particular area or region and nowhere else on Earth.