Carbon dioxide is a gas composed of carbon and oxygen. This gas is breathed out by people and animals and is absorbed by plants.
In each of the carbon dioxide molecules, one carbon atom is covalently doubly connected to two oxygen atoms. At room temperature, it exists as a gas. Its chemical formula is written as CO₂.
At atmospheric temperatures and pressures, this gas is colorless, odorless, non-toxic, and inflammable. This is produced as the byproduct of metabolic reactions in animals and people and is breathed out during respiration. But plants use this carbon dioxide to produce glucose and oxygen using photosynthesis.
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