In aerobic respiration, glycolysis is linked with Krebs’ cycle through acetyl Co-A because pyruvic acid first converted into acetyl Co-A and acetyl Co-A is enters in the Krebs’ cycle. The formation of acetyl Co-A is involved with some cofactors like ${Mg}^{2 +}$ ions, thiamine pyrophosphate $(Vit - B_{1}),\ NAD^{+},\ Co - A$ and lipoic acid.