Cellular respiration is the metabolic process by which a cell produces usable energy in the form of ATP. In order to accomplish this cells require Glucose and Oxygen to form the reaction which produces ATP and the byproducts of Water and CO2.
In reality its a complex topic however this is the basic form.
Answer: Your upper and lower arms are connected at your elbow by a hinge joint between your humerus and ulna.
Explanation:
Feces are deposited on the ground, and the bacteria in the soil breaks it down, and uses the nutrients