- Life Sciences
a social structure in which different classes are determined by heredity.
waste water from sinks, washing machines, dishwashers, showers and baths, which can be used for...
(also called egestion or elimination) the process of passing faeces out through the anus.
the inner region of the kidney, striped in appearance, made up of renal pyramids.
the trapping of the sun's heat energy by certain gases in the atmosphere, e.g. carbon dioxide...