During the Twentieth Century,life Expectancy in the United States

question 1

Multiple Choice

During the twentieth century,life expectancy in the United States:

• A) decreased.
• B) remained about the same.
• C) decreased,then increased during the twenty-first century.
• D) increased.

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Definitions:

Cycloheptane

A cyclic alkane with the molecular formula C7H14, consisting of a ring of seven carbon atoms.

Phenol

An aromatic organic compound with the formula C6H5OH, used as an antiseptic and a raw material in the synthesis of plastics.

Molecular Formula

A notation used in chemistry to show the types and numbers of atoms combined in a single molecule of a chemical compound.

Solute Dissolves

The process by which a solute integrates into a solvent, forming a solution, typically at a molecular level.