In an ecosystem, there is flow of energy at different trophic levels. This is as follows :

  • A

    Primary consumers — Tertiary consumers — Secondary consumers — Decomposers — Producers

  • B

    Producers — Primary consumers — Secondary consumers — Tertiary consumers — Decomposers

  • C

    Producers — Decomposers — Primary consumers — Tertiary consumers — Secondary consumers

  • D

    Producers — Primary consumers — Tertiary consumers — Secondary consumers — Decomposers

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