How the Body Uses Oxygen
How the Body Uses Oxygen
Oxygen is a colorless, odorless gas that is essential for life.[1] Life as we know it literally could not exist without oxygen. Billions of years ago there was very little oxygen in Earth’s atmosphere. Complex animal life did not, and could not, exist. The story of how the earth changed from a dead, oxygen-poor rock into the oxygen-rich, life-sustaining world we know now is a matter of…
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