ED LONG
Summary:
Our seven trillion body cells are largely composed of water and air. In a healthy body Oxygen concentration is three times that of air. Oxygen content was once 20% of the air people breathed — now, in some areas, it is down to less than 15%. It is the one thing that vital elements in our body have in common:
Protein (nitrogen, carbon, hydrogen, oxygen). Carbohydrates (carbon, hydrogen, oxygen). Water (33% oxygen).
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