During which stage of cellular respiration is glucose broken down into two molecules of pyruvic acid?
a.)electron transport chain b.)glycolysis
c.)krebs cycle
d.)acetyl coa formation

During glycolysis, glucose is metabolised into pyruvate, which is a three carbon compound. The process takes place inside cytosol. Molecular oxygen is not involved in the same, and a little energy is produced in the form of ATP molecules. Pyruvate is then oxidised to oxygen and carbon dioxide, with further production of ATP molecules.

Iwould say overuse ( but not 100% sure ) in the u.s. we tend to overuse water by leaving it running, throwing it away, taking long showers, etc.