Answer;
FADH2
Step-by-step explanation;
Glycolysis involves the breaking down of a sugar; generally glucose, although fructose and other sugars may be used; into more manageable compounds in order to produce energy.
Glycolysis produces 2 ATP, 2 NADH, and 2 pyruvate molecules: Glycolysis, or the aerobic catabolic breakdown of glucose, produces energy in the form of ATP, NADH, and pyruvate, which itself enters the citric acid cycle to produce more energy.