Oxygen to the brain doesn't come from food. It's extracted from the air by the lungs and distributed by the blood stream.
see Related Answer number two.
it needs floud
glucose
thiamine
For plants, phosphorus is an important nutrient because they need it for cell division and growth. Without this nutrient, plants can exhibit signs of stunted roots and leaf problems. Two other important nutrients needed by plants are nitrogen and potassium.
Calcuim is important to the health of a society, it is needed for healthy, strong bones and teeth. It is a nutrient. Calcium can also be used in chemistry.
The forgotten nutrient and the most important is water.
Water is an important nutrient because it is needed to hydrate your most important organs
vitamin A
carbohydrates and fats.
Glucose.
The brain is needed because if you didn't have a brain you wouldn't be able to do anything!
Iron, calcium and folic acid are especially important during pregnancy.
Fat
calcium