Aerobic Respiration: Requires Oxygen
Anaerobic Respiration: does not.
Anaerobic Respiration still breaks down glucose, and releases energy, but less energy compared to aerobic respiration. Anaerobic Respiration occurs when there is no oxygen (deep water-logged soils; muscles working too fast for oxygen to be delivered to them)...
BBC Bites: Anaerobic vs. Aerobic Respiration