Which process occurs in all living organisms at all times? a. cellular respiration. b. aerobic respiration. c. anaerobic respiration. d. photosynthesis

During cellular respiration, the products produced are CO2 and H2O. This is from the addition of oxygen to the glucose or carbon components. Cellular respiration is the opposite of photosynthesis which on the other hand uses CO2 and H2O to produce O2 and energy. Most living organisms need air so the answer is B. aerobic respiration