kindly tell me the r with the proper explanationn that how the statement--food change can be as long as any number of trophic level is correct!

Dear student,

The trophic levels are the fooding positions in a food chain or web. There are atleast two or three trophic levels. However, they are limited to a maximum of four because of the amount of energy flow decreases with the successive trophic level.

Therefore, the food chain relies on the number of trophic levels.

Regards,