Which of the following is the source of energy for an ecosystem?

How many trophic levels can a $Grazing$ $Food$ $Chain$ $(GFC)$ be divided into?

If $20 \, J$ of energy is trapped at the producer level,then how much energy will be available to the peacock in the following food chain (in $, J$)?
Plant $\to$ Rat $\to$ Snake $\to$ Peacock

What is the fraction of assimilated energy used in respiration by herbivores (in $\%$)?

The $10\; \%$ law is related to

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?