Final answer:
Carbon dioxide is a compound composed of carbon and oxygen. It is a gas under normal conditions but can become a solid known as dry ice if cooled down enough. It is an important compound in the cycle of life on earth and has been linked to global climate change.
Step-by-step explanation:
Carbon dioxide (CO2) is a compound composed of carbon and oxygen. It is a gas under normal conditions but can become a solid known as dry ice if cooled down enough. Carbon dioxide is an important compound in the cycle of life on earth. It is produced during the combustion of fossil fuels and is also a greenhouse gas that has been linked to global climate change.