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