Oxygen came first. It then formed ozone.
No, the ozone did not came from oxygen. Both co-exist at the same time.
Atmosphere. Ozone is formed by interaction between oxygen in the atmosphere, and UV-C from the Sun.
Oxygen when came in contact with UV broke down. It then reacted with more oxygen to form ozone.
Ozone was formed by irradiation of oxygen molecule. It is a molecule with formula O3. It is bent in shape and has sp and sp2 hybridised oxygen atoms.
Life came first. The oxygen in Earth's atmosphere is a product of living organisms carrying out photosynthesis.
It reduces the future amount of oxygen available. Less oxygen means less ozone. It increases the temperature below the thermocline, so it allows more water vapor across to reduce ozone levels. If the forest is burned, it releases chlorine-containing molecules into the air, some of which will make it to the ozone layer to reduce ozone levels. Looks like deforestation means less ozone into the future.
Anaerobic came first, because there was no oxygen in the Earth's original atmosphere.
Space and evolved from volcanic processes.
Various resolutions came out. Saving the ozone was one of them.
Technology has made ozone worst. With technology came CFC's and they made ozone deplete.
The ozone layer did start to damage early. It was when the CFC's came into act.
Carbon came first. Carbon is one of the most abundant elements in the universe and is formed in the core of stars through nuclear fusion reactions. Oxygen, on the other hand, is also formed in stars but typically in later stages of stellar evolution.