What Gas Makes Up Approximately 1/5th of Ordinary Air and Is

question 40

Multiple Choice

What gas makes up approximately 1/5th of ordinary air and is used by cells to release energy from food substances?

• A) Oxygen
• B) Carbon dioxide
• C) Hydrogen
• D) Nitrogen
• E) Helium

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Definitions:

Start-Up Manufacturers

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National Railroad

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Social Security Act

A law enacted in 1935 to create a system of transfer payments in which younger, working populations support older, retired populations through a tax-funded social insurance program.

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