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What process was primarily responsible for the development of the present percentage of free oxygen in the Earth's atmosphere?.

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The process is known as photosynthesis, and it involved creating gaseous, or free, oxygen from carbon dioxide, water, and sunshine.

Air or a gas: which is oxygen?

Oxygen is a transparent, tasteless, & cloud of gas that is essential for all life forms. It is ingested by animals, who then convert it to carbon dioxide, which is then used by plants to create new carbon and release oxygen back into the atmosphere.

Is oxygen pure enough for you to breathe?

Normal air only has a 21% oxygen content. As a result of the high oxygen content, all of the body's organs may benefit from having enough oxygen. Long-term inhalation of 100% oxygen can, unfortunately, alter the lungs in ways that could be dangerous.

To know more about Oxygen visit:

https://brainly.com/question/2272415

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