Water.
water
it has 40 percent
Oxygen is not considered a primary or secondary macronutrient. It is a non-mineral nutrient.
oxygen
Glucose and Oxygen
There is hardly any oxygen available at low depths, thus making oxygen a survival challenge in the deep.
Protein
hemoglobin
Oxygen
Based upon how fast you can loose consciousness when deprived, oxygen is the most indispensable nutrient.
The percent of oxygen is 53,298 %.
water!
Water