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Anaerobic means without air (âanâ means without). Sometimes there is not enough oxygen around for animals and plants to respire, but they still need energy to survive. Instead they carry out respiration in the absence of oxygen to produce the energy they require this is called anaerobic respiration.
These organisms use aerobic respiration when. oxygen is present, but when oxygen is in short supply, they use anaerobic respiration. instead. Certain bacteria can only use anaerobic respiration. In fact, they may not be. able to survive at all in the presence of oxygen. Fermentation.