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a group of organs that work together to perform a certain task.
a United Nations treaty that was drawn up during a meeting of countries in Japan in 1997. It...
ecotourism that is carried out thoughtfully, morally and in a way that is acceptable to all...
a complex organic substance needed by the body in small amounts for normal growth and...
a molecule that is converted to adenosine triphosphate (ATP) for energy storage.