Fat
Fat has the most calories per an ounce. There are 9 calories per a gram, so an ounce of fat has 255.06 calories.
The most energy rich nutrient is fat. There are two other nutrients that produce energy for the body and they are protein and carbohydrates.
proteins
The mitochondria release energy from nutrient molecules and transform the energy into a usable form. They are one of the most important organelle in the cell.
Fat.
protein protein
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fat
Although the body is able to use energy also from fat and protein, the most preffered nutrient for energy production in the body are carbohydrates.
It depends on the material. Most metals obey the maximum distortion energy law in which the shear yield is the tensile yield divided by square root of 3, or 0.577 x tensile yield.
fat