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waste water from sinks, washing machines, dishwashers, showers and baths, which can be used for flushing toilets or watering the garden.
extremely small infectious particles that can only reproduce inside a host cell.
(also called physical digestion) the breaking down of food into smaller pieces using mechanical...
consists of the pectoral and pelvic girdles together with the arms and legs.
the natural resistances with which a person is born. It occurs because of a body's genetic make-...