Oxygen is the most abundant element by mass (approx. 65%), largely due to its presence in water (H₂O). Carbon (approx. 18.5%) forms the backbone of organic molecules. Hydrogen (approx. 9.5%) is also abundant in water and organic compounds. Nitrogen (approx. 3.2%) is a key component of proteins and nucleic acids.
The elemental composition of an adult human body by mass is
Asked in UPSC CDS 2 2016 · Topic: Human Anatomy and Physiology (Cellular and Tissue Organization)
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