The gas produced as a waste product during respiration is carbon dioxide (CO2). Respiration occurs in all living organisms and is the process by which cells convert glucose and oxygen into energy. During this process, carbon dioxide is generated as a byproduct when glucose is broken down in the presence of oxygen to release energy. The body then expels carbon dioxide through the lungs when we exhale. This exchange of gases is crucial for maintaining the proper balance of oxygen and carbon dioxide in the atmosphere and for sustaining life on Earth.