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Three of the following are renewable sources. The exception is

  • A.solar radiation
  • B.wind
  • C.biomass grown on a sustainable cycle
  • D.natural gas

Answer: D

Gas is a fossil fuel formed over geological time and is not replenished on any human scale. Biomass counts as renewable only where it is regrown as fast as it is burnt, which is a condition rather than an automatic property.

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