Biology · Biology
The human body is composed of approximately 99% of which elements by mass?
- 1Oxygen, Carbon, Hydrogen, Nitrogen✓
- 2Calcium, Phosphorus, Potassium, Sulfur
- 3Sodium, Chlorine, Magnesium, Iron
- 4Iodine, Zinc, Copper, Selenium
Correct answer
Oxygen, Carbon, Hydrogen, Nitrogen
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