It depends on how you define nutrient. Oxygen is an oxidizing agent. The foods you eat are generally reducing agents. Reducing agents and oxidizing agents react to form new compounds with the release of energy. I suppose it could be considered a nutrient but this term is usually used for the energy containing component of food.
oxygen
hemoglobin
you need oxygen to breath so that is how the nutrient cycle is important.
artery
it cleans the plants oxygen and takes it and turns it into nutrient so the plant can stay healthy
Oxygen is not considered a primary or secondary macronutrient. It is a non-mineral nutrient.
Glucose and Oxygen
oxygen
hemoglobin
Protein
Based upon how fast you can loose consciousness when deprived, oxygen is the most indispensable nutrient.
Water
water!
Based upon how fast you can loose consciousness when deprived, oxygen is the most indispensable nutrient.
you need oxygen to breath so that is how the nutrient cycle is important.
carbohydrate
Carbon, Nitrogen, Oxygen