In an ecosystem, energy flows in:

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(A) Energy flow in an ecosystem is always unidirectional. It moves from producers (plants) to primary consumers (herbivores) and then to secondary/ter

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One direction

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(A) Energy flow in an ecosystem is always unidirectional. It moves from producers (plants) to primary consumers (herbivores) and then to secondary/tertiary consumers (carnivores). Energy is never transferred back from higher trophic levels to lower trophic levels, and a significant amount of energy is lost as heat at each transfer, as per the $10\%$ law.

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