The carbon containing molecule found in the atmosphere that is often released by respiration is

The answer is Carbon Dioxide (CO2)

Explanation:

Carbon dioxide (CO2) is a chemical compound that is composed of a carbon atom bonded with double covalent bonds to two oxygen atoms. CO2 exists naturally in the Earth's atmosphere and is the main source of carbon for life on Earth, which is also a product of the respiration of all aerobic organisms. CO2 is also produced during the processes of decomposition of organic materials and the fermentation of sugars in the manufacture of wine, beer and bread.