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Jasmineeecx
Because Glycolysis, juts like Cellular Respiration, needs a molecules that picks up electrons. Glycolysis needs molecules of NAD+. 
Topmadworld
Hello there,
Fermentation does not make energy but it makes CO2 and it starts with glucose, goes through glycolysis and gets pyruvates. Fermentation allows glycolysis to continue. It also allows glycosis to occur without oxygen

Hope this helps :))

~Top