Question

fermentation reactions
completely oxidize glucose to carbon dioxide and water
often require the reactions of glycolysis to provide energy as atp
supply nad+ for the oxidation of glucose
operate in the presence of oxygen

Explanation:

Fermentation is an anaerobic process. It occurs in the absence of oxygen. During glycolysis in fermentation, NAD+ is required to keep the process going for energy - production in the form of ATP. Fermentation does not completely oxidize glucose to carbon dioxide and water like aerobic respiration. Glycolysis in fermentation provides some energy as ATP but has different end - products depending on the type of fermentation.

Answer:

supply NAD+ for the oxidation of glucose