Fermentation is a process where organic compounds are broken down in the presence of oxygen
most of the ATP is made in cellular respiration
sugars are created in photosynthesis
organic compounds are broken down in the absence of oxygen

organic compounds are broken down in the absence of oxygen

Explanation

for example alcoholic fermentation done by Saccharomyces Cerevisae

C6H12O6-->2CO2+2C2H5OH

when a reversible reaction is occurring in both directions at the same rate; the products and reactants do not change in concentration. a chemical reaction where the compound is broken into its constituent parts.

cellular respiration oxidizes food into energy in the form of atps.

glycolysis (6 c hexose) > 2x atps are used > 6c hexose biphosphate > 2 x 3c triphosphate >

2 x 3c pyruvate (2x nadh produced from nad) and (4x atp produced)

pyruvate actively pumped mitochondrial matrix.