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the process in which micro-organisms, such as yeast, convert sugars into alcohol under anaerobic conditions.
(also called egestion or elimination) the process of passing faeces out through the anus.
the part of the atmosphere that contains the ozone layer and is about 10 km above the Earth's...
water that is found on the surface of the earth, e.g. in rivers, streams, and lakes etc.
tissue that covers the surfaces of the body (the skin) and lines the ducts of the gut.