Oxygen
For the majority of animals oxygen is essential to
carry out their metabolic processes.
Although for some microorganisms oxygen is a
toxic element.
Where do these organisms live?
Do these organisms respire?
All organisms respire because respiration is
esencial to life but in the absence of oxygen the
process is carried out in a different way, even
some of our cells are able to do this process.
Glucose------------------ Lactic acid + energy
absence of O2