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Production of electricity by water power

In descriptive writing, the conclusion should introduce a new idea return the discussion to the general level use a quotation explain why the essay was effective

How can behavioral science be applied in improving public health? a.by tracking a disease to determine its sourceb.by creating promotions that improve health habitscboth by tracking a disease to determine its source and by creating promotions that improve health habitsd.neither by tracking a disease to determine its source or by creating promotions that improve health habits