Kreb's Cycle requires acetyl CoA which is an end product of glycolysis and link reaction.
Step-by-step explanation:
Kreb's Cycle does not produce ATP, does not require oxygen. NADH is produced in the eight-step reactions of TCA or Kreb's Cycle.
The 2 molecules Pyruvate is the end product of glycolysis. In the link reaction, Pyruvate Dehydrogenase converts 2 Pyruvate molecules into 2Acetyl CoA which further gets converted to Oxaloacetate to enter into TCA cycle.
In the TCA cycle carbon dioxide is released. This cycle is independent of oxygen as it is itself a part of the complex anaerobic process of cellular respiration.