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CO2 is formed when materials containing Carbon burn in the air (which contains Oxygen).

Materials containing carbon are mainly of biological in origin (wood, grass, coal, oil gas, charcoal etc).

When animals and humans inhale air, they are utilizing the oxygen and use it for cellular respiration. Yet the products of cellular respiration are carbon dioxide and water, both of which can be eliminated from the body through exhalation. Plants make their food using carbon dioxide and 'exhale' oxygen; the cycle starts over again.

Carbon dioxide can also come out of volcanoes as a natural gas.

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16y ago

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