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a black substance that coats the lungs of a smoker, causing cancer of the respiratory tract.
extremely small infectious particles that can only reproduce inside a host cell.
list of questions or statements that are used to classify or identify a living organism.
this muscle 'opens' or straightens the joint when it contracts (so the angle between the two...
in plants: the first plant to become established in an area.in plants: the first plant to become...