Biogas can be a good substitute for

  • A
    Fuel wood
  • B
    Petroleum and oil
  • C
    Coal
  • D
    Charcoal

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In developing countries,the heaviest demand on forests is for

Which one of the following is a renewable source of energy?

The primary energy source for the Earth is:

Biogas produced by anaerobic fermentation of water biomass consists of

$A$ non-polluting source of energy is

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