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Which of the following can function as a chelating agent?
United States
A country located in North America, comprising 50 states and known for its significant influence on global economics, politics, and culture.
Poverty Rate
The proportion of a population living below the national poverty line, indicating the level of poverty in a country.
Billion
A numerical value representing one thousand million (1,000,000,000) in the American short scale system, commonly used in counting currency and population.
Million
A numerical value representing one thousand thousands, or 1,000,000.
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