Which one of the following components of an ecosystem comes from outside?

Energy enters into the ecosystem through

Which of the following has the greatest amount of energy?

Only a small amount of the energy stored in food is available to the next organism in a food chain because

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

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 $\%$)