The carbon dioxide that we exhale is produced by what process?

A. Calvin cycle

B. Glycolysis

C. Krebs cycle

D. Photosynthesis

C. Krebs cycle

The main function of the Krebs cycle is to generate energy for the cell. The Krebs cycle is also known as the citric acid cycle and is part of cellular respiration. Cellular respiration is a series of chemical reactions that cells use to break up sugars into a form that the cell can use. Cell respiration requires oxygen to take place.