Choose the correct sentence regarding the carbon cycle.

  • A
    In the composition of living organisms,carbon constitutes $49\%$ of the dry weight of organisms and is next only to water.
  • B
    Fossil fuels do not represent a reservoir of carbon.
  • C
    According to one estimate,$4 \times 10^{13} \text{ kg}$ of carbon is fixed in the biosphere through photosynthesis annually.
  • D
    Rapid deforestation and massive burning of fossil fuels for energy and transport have significantly increased the rate of release of carbon dioxide into the atmosphere.

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