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the small amount of air that always remains in the lungs during breathing.
external opening of the rectum (part of the mammalian digestive tract) through which faeces are...
the liquid produced by the kidneys consisting mainly of water and nitrogenous wastes such as...
the broad band of tissue in plant organs under the epidermis, including the parenchyma cells and...
the part of the atmosphere that contains the ozone layer and is about 10 km above the Earth's...