Common molecule formed from all food stuffs during aerobic respiration is

The sequence of food substances consumed during starvation is:

When acting as a respiratory substrate,which of the following would be broken down to acetyl Co-$A$?

Which of the following pairs is a combination of the highest and lowest energy molecules?

Given below are two statements:
Statement $I$ - Reactions involved in Krebs cycle are anabolic and catabolic.
Statement $II$ - During oxidation of acetyl $CoA$,stepwise oxidation of the acetyl part of acetyl $CoA$ occurs.
In light of the above statements,choose the most appropriate answer from the options given below.

Which term is used to describe the respiratory pathway?