Why are crop fields known as artificial ecosystems?

  • A
    They are created by nature.
  • B
    They are managed and maintained by humans.
  • C
    They contain only one type of organism.
  • D
    They do not have any abiotic components.

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Which organisms perform photosynthesis to prepare food for themselves and other organisms?

State with reason any two possible consequences of the elimination of decomposers from the Earth.

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