What happens during the krebs cycle?
atp and nadh from food are converted to co2 and o2.
nadh from glycolysis is converted to atp and o2 molecules.
glucose is broken down in a cycle of reactions to form pyruvate.
pyruvate is broken down in a series of reactions to form co2.

This is the correct option: NADH FROM GLYCOLYSIS IS CONVERTED TO ATP AND O2 MOLECULES. In the Kreb's cycle, two molecules of pyruvate which are formed from glycolysis are converted to NADH, FADH2 AND ATP. The reaction occurs in the mitochonria and each series of reaction produces two carbon molecules, one ATP and reduced form of NADH and FADH2.

The answer is a if u read the definition it makes sense