Energy flow in an ecosystem is.......

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(B) In an ecosystem, energy enters from the sun and is captured by producers (plants) through photosynthesis. As energy moves from one trophic level t

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Unidirectional

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(B) In an ecosystem, energy enters from the sun and is captured by producers (plants) through photosynthesis. As energy moves from one trophic level to the next (e.g., from producers to primary consumers, then to secondary consumers), a significant portion of energy is lost as heat at each transfer, according to the $10\%$ law of energy transfer. Because energy cannot be recycled back to the sun or reused by the previous trophic level, the flow of energy is always unidirectional (one-way). Therefore, the correct option is $B$.

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