two organisms that switch to anaerobic respiration at times

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Organism which can produce ATP by aerobic respiration in the presence of oxygen and when oxygen is absent, can switch to the process of fermentation or anaerobic respiration is known as facultative anaerobe. 

Examples include: Yeast, species of Staphylococcus, Streptococcus, Escherichia coli.

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this is not  an organism but our muscles breath anaerobically some times and  produce lactic acid 
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Our muscles breathe anaerobic respiration and muscles cramp due to heavy exercise and form Lactic acid and energy.
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your question is not clear!
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follow 00 
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