If you mean how does it come to be in the atmosphere, oxygen is released into the atmosphere by plants, mostly by phytoplankton in the ocean.
I you mean how is oxygen created in the first place, it is the result of lighter elements being fused together in the cores of stars.
Fermentation can occur in the absence of oxygen. This process allows for the production of energy in the form of ATP without the need for oxygen.
If a process does not require oxygen, it is anaerobic. This means it can occur in the absence of oxygen.
No, oxygen is not a fuel. It is a gas that is necessary for combustion to occur, but it is not a source of energy itself.
Brain damage can occur within minutes of not receiving oxygen, with irreversible damage starting to occur after about 4-6 minutes. The longer the brain is deprived of oxygen, the more severe and long-lasting the damage is likely to be. Treatment must be administered quickly to minimize the extent of brain damage.
Luciferin, and enzyme called luciferase. Bioluminescence does not occur in the absence of oxygen.
oxygen
Oxygen exchanges occur in the lungs where the circulatory system takes in oxygen and releases carbon dioxide into the lungs. Oxygen exchanges also occur in the capillaries where the circulatory system delivers oxygen to the cells and picks up carbon dioxide from the cells.
Fermentation can occur in the absence of oxygen. This process allows for the production of energy in the form of ATP without the need for oxygen.
No - glycolysis is anaerobic (it does occur in the presence of oxygen).
Some oxygen isotopes are radioactive, but they do not occur naturally.
If a process does not require oxygen, it is anaerobic. This means it can occur in the absence of oxygen.
Oxygen is necessary for the fermentation process to occur.
Iron has to be exposed to oxygen for oxidation to occur.
no
Oxygen
It is TRUE that AEROBIC respiration requires oxygen to occur. It is FALSE that ANAEROBIC respiration requires oxygen to occur. It is FALSE that cells are DEPENDENT on AEROBIC respiration.
Capillaries