Energy for the detritus food chain comes from

The number of trophic levels in the grazing food chain is restricted as the transfer of energy follows . . . . . . %. (in $%$)

In any ecosystem,at which trophic level is the least amount of energy stored?

The transfer of energy from organisms to organisms in a natural community establishes

The transfer of energy from one trophic level to another occurs according to the second law of thermodynamics. What is the average efficiency of energy transfer from herbivores to carnivores (in $\%$)?

Identify the missing link in the following food chain:
Plants $\to$ Insect $\to$ Frog $\to$ $A$ $\to$ Hawk.