Fat is the most efficient molecule for long-term energy storage, even compared to carbohydrates, because
a. with their numerous hydrogen atoms.
b. fats provide an abundant source of high-energy electrons fats can directly enter the electron transport chain, the phase of respiration that produces the most atp compared to carbohydrates.
c. fat produces fewer toxic by-products when it is metabolized when compacted.
d. fat occupies less volume than an equivalent amount of carbohydrate p.