What are 6 main elements that make up 98% of our body mass

oxygen, carbon, hydrogen, nitrogen, calcium, and phosphorus.

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What element makes up most of the human body?

Nitrogen – 2.4kg !

The four most abundant elements in the human body – hydrogen, oxygen, carbon and nitrogen – account for more than 99 per cent of the atoms inside you. They are found throughout your body, mostly as water but also as components of biomolecules such as proteins, fats, DNA and carbohydrates.

d) all choices are correct