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If a researcher finds that there is a correlation between secondhand smoke and children's asthma, he knows for SURE that _____.
U.S. Dollars
The official currency of the United States, widely used as a standard of exchange in international transactions.
U.S. Dollar
The U.S. Dollar is the official currency of the United States, widely used as a benchmark in international trade and as a global reserve currency.
Imported Goods
Products or services that are brought into a country from another country for sale.
U.S. Exports
Goods and services produced in the United States and sold to other countries.
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