Which of the following is not true regarding an ecosystem?

  • A
    Self-sufficient unit
  • B
    Cyclic exchange of materials between living beings and the environment
  • C
    Only requirement is input of energy
  • D
    Characterized by a major vegetation type

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Out of the following biogeochemical cycles, which ones are gaseous?
$I.$ Sulphur
$II.$ Phosphorus
$III.$ Nitrogen
$IV.$ Carbon
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