In the four steps of "AEROBIC CELLULAR RESPIRATION" where do the Intermediate Step take place in a cell; Krebs Cycle - Where does it take place in a cell?; Electron Transport Chain - Where does it take place in a cell?

Question

In the four steps of "AEROBIC CELLULAR RESPIRATION"  where do the Intermediate Step take place in a cell; Krebs Cycle - Where does it take place in a cell?; Electron Transport Chain - Where does it take place in a cell?