What do ecologists call the transfer of energy that begins with the sun and passes from one organism to the next in a food chain?

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 $\%$)?

In an ecosystem, energy flows in:

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

The percentage of energy transferred to the higher trophic level in a food chain is ....... (in $\%$)

The transfer of energy from one trophic level to another follows the second law of thermodynamics. The efficiency of energy transfer from herbivores to carnivores is: (in $\%$)