10 . Oxidation of organic substances is accompanied by reductior of: (indicate one or more answers) tetrahydrofolate thiamine pyrophosphate FAD ascorbic acid NAD^+

The correct answers are:- FAD (Flavin Adenine Dinucleotide)- (Nicotinamide Adenine Dinucleotide)Explanation:During the oxidation of organic substances, certain cofactors and coenzymes are reduced. FAD and are two such cofactors that are reduced during the oxidation process. FAD is reduced to FADH2, and is reduced to NADH. These reduced forms then carry the electrons to the electron transport chain for ATP production.