Top-soil contains the following:

  • A
    Humus and living organisms only
  • B
    Humus,living organisms and soil particles
  • C
    Humus,living organisms and plants
  • D
    Humus and soil particles only

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$(a)$ What makes the biosphere a stable system?
$(b)$ What happens when the components of the biosphere interact with each other?

Write the names of two biologically important compounds that contain both nitrogen and oxygen.

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