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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.
kingdom of multicellular eukaryotic organisms that do not have cell walls, feed...
large spongy organs in which gaseous exchange takes place in vertebrates (with the exception of...
energy resources such as coal and oil, which are being used up much more quickly than they can...