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

Name: 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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Quizplus · Accepted Answer

Oxygen makes up about 21% of Earth's atmosphere and is essential for cellular respiration, where it helps release energy from food.

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