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

  • A
    Primary consumers $\rightarrow$ Tertiary consumers $\rightarrow$ Secondary consumers $\rightarrow$ Decomposers $\rightarrow$ Producers
  • B
    Producers $\rightarrow$ Primary consumers $\rightarrow$ Secondary consumers $\rightarrow$ Tertiary consumers $\rightarrow$ Decomposers
  • C
    Producers $\rightarrow$ Decomposers $\rightarrow$ Primary consumers $\rightarrow$ Tertiary consumers $\rightarrow$ Secondary consumers
  • D
    Producers $\rightarrow$ Primary consumers $\rightarrow$ Tertiary consumers $\rightarrow$ Secondary consumers $\rightarrow$ Decomposers

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