Flow of energy in an ecosystem is always

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

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unidirectional

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(C) 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 step, according to the $10\%$ law.Because energy cannot be recycled or reused by the producers once it is lost as heat, the flow of energy is strictly unidirectional, moving from the sun to producers and then to higher trophic levels.

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