Glycolysis only in organisms that breathe in oxygen

Glycolysis is a process by which glucose is broken down into pyruvic acid in the cytoplasm of the cell. this process will occur in presence or absence of oxygen and therefore will not only occur in organisms that breath oxygen. in aerobic organisms, after the pyruvic acid has been formed it enters into mitochondrion where it undergoes a series of reaction to release more molecules of ATP. the final step in mitochondrion involves a reaction between oxygen and hydrogen ions to produce water as one of  final products of respiration. in anaerobic organisms the pyruvic acid produced by the glycolysis is converted to molecules of lactic acid as the final product of respiration.    

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