Your dashboard's instrument cluster has a light on it that either says OIL or looks like an old fashioned oil can. What should you do if you see this light while you're driving? Stop the car! This is one warning light that isn't joking. The oil light comes on when your engine suffers a drop in oil pressure. Without oil pressure it can't lubricate itself, and the result is self-destruction, meaning you have to do some seriously expensive internal engine repairs.
An anaerobic organism or anaerobe is any organism that does not require oxygen for growth. It may react negatively or even die if oxygen is present. An anaerobic organism may be unicellular (e.g. protozoans, bacteria) or multicellular.
Anaerobic respiration is respiration that uses electron acceptors  other than oxygen. Anaerobic respiration can be found in protozoans  and bacteria. Anaerobic respiration is a type of cellular respiration. It occurs  when oxygen is not available or is available in very low  quantities. It is also a respiration in the absence of oxygen. Oxygen is not used as the final electron acceptor.