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Explain the methods the kidney uses to help control the pH of the blood.
Social Security System
A government program that provides financial assistance to retirees, disabled workers, and survivors of deceased workers.
Tax Bracket
A range of incomes taxed at a given rate.
Average Tax Rate
The ratio of the total amount of taxes paid to the total taxable income, showing the share of income that goes to taxes.
Marginal Tax Rate
The rate at which the last dollar of income is taxed, indicating the percentage of an additional dollar of earnings that will be paid in tax.
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