How the hell do I know!!!!!!!!!!!!!!! ()
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Water is not an element, it is made of Hydrogen and Oxygen. Oxygen is the most plentiful element in the human body by weight. If you go by number of atoms, then Hydrogen would be the most plentiful.
Water
which nutrient supplies the body with the most calories
Based upon how fast you can loose consciousness when deprived, oxygen is the most indispensable nutrient.
carbohydrates
An important nutrient would be beta carotene, which the body uses to make Vitamin A.
protein
more plentiful, most plentiful
The most plentiful salt in the ocean is sodium chloride (NaCl)
Helium is the second most plentiful element in the universe.
fat
vitamin c