Answer: food, chemical
Step-by-step explanation:
Cellular respiration is a process in which the food or glucose reserve is oxidized so as to produce chemical form of energy in the form of ATP, that is used by the body's cell to perform metabolic activities within the cell. During this process the glucose in the presence of oxygen is converted into water and carbon dioxide and the chemical form of energy so produce is called adenosine triphosphate or ATP. Thus in the end chemical energy is produced.