Which of the following is not reused or recycled within an ecosystem?

Biology Mcqs for PPSC, FPSC, NTS, and Pakistan government job tests. Select an option below, then read the explanation.

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Subject
Biology Mcqsbiology-mcqs
Published
4 Dec 2022
Last updated
28 May 2026

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Explanation

Energy is not recycled in ecosystems. Only about 10% of energy is transferred from one trophic level to the next, while the remaining 90% is lost as heat during metabolic processes. In contrast, substances like carbon and oxygen cycle continuously within the ecosystem.

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