Question

which is required for both anaerobic respiration and aerobic respiration?
oxygen
water
mitochondria
glucose

Explanation:

Aerobic respiration uses oxygen to break down glucose and produce a large amount of energy, water and carbon - dioxide. Anaerobic respiration occurs in the absence of oxygen and breaks down glucose to produce less energy and other products like lactic acid or ethanol. Both start with glucose as the initial substrate for energy - yielding reactions. Oxygen is only required for aerobic respiration. Water is a product of aerobic respiration. Mitochondria are the main site of aerobic respiration, while anaerobic respiration can occur in the cytoplasm without mitochondria.

Answer:

glucose