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As energy moves progressively through trophic levels, what happens to its availability to the previous level?

Question
As energy moves progressively through trophic levels, what happens to its availability to the previous level?
It remains fully available to the previous level
It becomes twice as available to the previous level
It is no longer available to the previous level
It creates a feedback loop with the previous level
Answer
It is no longer available to the previous level
Detailed Explanation
Once energy moves to a higher trophic level, it is no longer available to the previous (lower) trophic level, consistent with unidirectional flow. — Examisthan.com
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