In an amphibolic pathway,fatty acids would be first degraded into..........

The following figure shows an amphibolic pathway. What are $P$,$Q$,and $R$?

$A-$ Breaking down processes within the living organism is anabolism and synthesis is catabolism.
$R-$ The proteins would be degraded by proteases and the individual amino acids (after deamination) depending on their structure would enter the pathway at some stage within the Kreb's cycle or even as pyruvate or acetyl $CoA$.

$A$: The tricarboxylic acid $(TCA)$ cycle is an amphibolic pathway.
$R$: $A$ number of $TCA$ cycle intermediates are used in various catabolic reactions only.

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

The link between glycolysis,the Krebs cycle,and the $\beta$-oxidation of fatty acids/carbohydrate and fat metabolism is ...........