Flow of energy in an ecosystem is always

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(B) In an ecosystem, energy enters from the sun in the form of solar radiation. Producers (plants) capture this energy and convert it into chemical en

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unidirectional

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(B) In an ecosystem, energy enters from the sun in the form of solar radiation. Producers (plants) capture this energy and convert it into chemical energy 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 of energy transfer. Because energy cannot be recycled or reused by the producers once it is lost as heat, the flow of energy in an ecosystem is always unidirectional.

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