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Fat...
Fat with 9 calories per gram
Most of Gram+ bacteria and for Gram- ones, Segnilliparus spp.
In food, there are three macronutrients that provide energy. They are fat, carbohydrates, and protein. Fat is the nutrient that provides the greatest amount of energy at nine calories per gram. Protein and carbohydrates provide only four calories per gram.
The most energy rich nutrient is fat. There are two other nutrients that produce energy for the body and they are protein and carbohydrates.
Fat has the most calories per an ounce. There are 9 calories per a gram, so an ounce of fat has 255.06 calories.
Lipids store more energy per gram than carbohydrates or proteins.
Carbohydrates and fats are the two most commonly used molecules for energy in the body. Carbs burn at 3.75 kilocalories/gram and fats are roughly twice as energetic
Carbohydrate's I think.
Topsoil contains all the most recently decomposed bio-matter . It is therefore the most nutrient rich layer, best for growing plants and such.
This element is sodium.
The forgotten nutrient and the most important is water.