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Strontium,Sr (number 38) ,is especially dangerous to humans because it tends to accumulate in calcium-dependent bone marrow tissues (calcium,Ca,number 20) .This fact relates to the organization of the periodic table in that strontium and calcium are both
Economy
A system of production, distribution, and consumption of goods and services within a particular geographical region.
Federal Gasoline Tax
A tax imposed by the federal government on the sale of gasoline.
Highway Maintenance
The process of keeping roads in safe and workable condition, including repairs, repaving, and cleaning activities.
U.S. Labor Force
The total number of individuals in the United States who are actively employed or seeking employment.
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