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the liquid produced by the kidneys consisting mainly of water and nitrogenous wastes such as urea and salts.
an injection of a weakened or dead pathogen into the body to build up immunity against a disease...
responsible, low impact, usually small- scale travel to protected, unspoilt, natural areas and...
an infection of the skin, caused by a parasitic mould. It causes small, red itchy circles on the...
a black substance that coats the lungs of a smoker, causing cancer of the respiratory tract.