Answer:
[tex]\large{\mathfrak{Unidirectional}}[/tex]
Explanation:
•The series or organisms taking part at various biotic levels form a food chain.
•Each step or level of the food chain forms a trophic level.
•The flow of energy in a food chain is unidirectional.
•The energy that is captured by the autotrophs does not revert back to the solar input, the energy which passes to the herbivores does not come back to autotrophs and so on.
•As it moves progressively through the various trophic levels it is no longer available to the previous level.
