Bidirectional, flowing both ways between trophic levels
Unidirectional, flowing from one trophic level to the next only
Random with no fixed direction
Absent entirely
Answer
Unidirectional, flowing from one trophic level to the next only
Detailed Explanation
The chapter clearly states that the flow of energy in an ecosystem is unidirectional; energy does not revert back to a previous trophic level. — Examisthan.com