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the liquid produced by the kidneys consisting mainly of water and nitrogenous wastes such as urea and salts.
a sticky film that forms on the enamel of teeth. It is made up of small food particles, saliva...
a layer of ozone gas which occurs naturally in the upper atmosphere, and protects life by...
outgrowths that transmit nerve impulses away from the cell body of a neuron.
(SO2) a colourless gas that smells of rotten eggs or burnt matches and is produced by...