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'''Carbon dioxide''' is exhaled when you breathe out.
'''Carbon dioxide'''
At room temperature, it is a gas.
It is exhaled when you breathe out.
It is used by plants in the process of [[photosynthesis]] to generate [[oxygen]].
It is used by plants in the process of [[photosynthesis]] to generate [[oxygen]].
Each molecule of carbon dioxide has one carbon atom and two oxygen atoms, so its chemical formula is CO<sub>2</sub>.