EnergyMetabolism/NutrientAndEnergyy/EnergyMetabolismWithoutOxygen

The energy metabolism without the use of oxygen is not so efficient. Out of the 6 chemical energy (shown in red line) inside the nutrient, 2 are removed and 4 remains inside the degradation product.

Please be noted that the actual degradation are not simply the break down of connection, but with the insert of H and OH,