Final answer:
The inputs of cellular respiration are oxygen and glucose, with glucose providing the fuel and oxygen being essential for the aerobic breakdown of glucose to produce energy (ATP).
Step-by-step explanation:
The inputs of cellular respiration are oxygen and glucose. Oxygen is required for the aerobic steps of cellular respiration and is inhaled by organisms. Glucose is obtained through the foods that organisms eat and is broken down to release energy in the form of ATP. The main product of cellular respiration is ATP, which is used as the energy currency in cells, and the waste products include carbon dioxide and water. The correct answer to the question is a) Oxygen and glucose.