Why would the EU feel it would be important to use common currency? (eu stands for European union)

To remove business risks which cane from currency fluctuations.Business relations across European borders became a lot easier which benefits the economies of all participating countries.

The answer to this question is  c. pharmaceutical accumulation  reclaimed water refers to the water that being used again after it already  used for agricultural purposes.this type of water often contains pharmaceutical accumulation because of the chemical fertilizer that is used for the plants is absorbed into the water.