Lemurs’ bodies are adapted to efficiently store energy for times when food is scarce. this adaptation may to explain how lemur ancestors survived the trip across the mozambique channel from mainland africa to madagascar. which of the following types of molecules are primarily used for long-term energy storage in the lemur?

lipids
monosaccharides
nucleic acids
proteins

Lipids.

Explanation:

The large carbon -hydrogen bonds(C-H) in chains of lipids makes them ideal storage of energy.

The more C-H bonds breakage, the higher protons availability from Citric acid cycle NADH and FADH2  and hydrogen atom splitting (to protons and electrons) for  the electron transport chains (ETC), and therefore the higher proton pumps for  more ATP's synthesis in the mitochondria matrix.  

In addition large number of electrons  surrounding carbon atom in fatty acids than other food molecule is added factor.  The transfer of these electrons to oxygen during oxidation of fatty acids releases large amount of energy (9 kilo calorie) into the cells,  more than other food substances