Robert Constanza and his colleagues have put an average price tag of how much for ecosystem services?

  • A
    $US$ $18$ million
  • B
    $US$ $33$ trillion
  • C
    $US$ $50$ billion
  • D
    $US$ $33$ million

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Estuaries are considered as nutrient-rich and trap:

An ecosystem is $...............$.

The most stable ecosystem is:

The biosphere is defined as:

Who coined the term 'Ecosystem'?

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