what is oxygen??????
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it's a air part as you see there are many gases in air and O2 is one of them
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- Oxygen plays a critical role in respiration, the energy-producing chemistry that drives the metabolisms of most living things.
- We humans, along with many other creatures, need oxygen in the air we breathe to stay alive.
- Oxygen is generated during photosynthesis by plants and many types of microbes.
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