A colorless, odorless gas produced by burning carbon and organic compounds and by respiration. It is naturally present in air (about 0.03 percent) and is absorbed by plants in photosynthesis.
- Chemical formula: CO2
- This fixed air is carbon dioxide, into which carbonates decompose when heated.
- For example, plants give out oxygen and animals expel carbon dioxide and methane.
- This difference makes it possible for organisms to build up carbon compounds from carbon dioxide.
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