Atmosphere: Around 21 percent of the oxygen by volume is present as free oxygen. Other oxygen-containing molecules include ozone, water vapors, carbon dioxide, oxides of sulfur and nitrogen.
Biosphere: Around 22 percent of the oxygen by volume is present as the composition of organic matter and water molecules.
Hydrosphere: Around 33 percent of the oxygen by volume is present in the hydrosphere. It is present in the form of dissolved oxygen, components of water molecules and carbonic acids.
Lithosphere: Around 47 percent of the oxygen by volume is present as oxide minerals such as silica minerals et cetera.
Because the energy to drive ATP synthesis in mitochondria ultimately derives from the oxidative breakdown of food molecules, the phosphorylation of ADP to form ATP that is driven by electron transport in the mitochondrion
because it in DNA so it would not be uracil as uracil is in RNA so instead it would be thymine (T) and u can also remember it as Apple Tree and Car Garage.
