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ecotourism that is carried out thoughtfully, morally and in a way that is acceptable to all people.
a substance, usually a liquid, in which other substances can dissolve.
waste water from sinks, washing machines, dishwashers, showers and baths, which can be used for...
simple inorganic chemical substances (mineral salts) that are needed in very small amounts for...
the fluid that circulates through the lymphatic system. It is similar to blood plasma in...
having similar parts regularly arranged around a central axis.