Choose correct sentence for carbon cycle.
- AIn the composition of living organisms, carbon constitutes $39\% $ of dry weight of organisms and is next only to water.
- BFossil fuel not represent a reservoir of carbon
- CAccording to one estimate $5 \times 10^{13}\ kg$ of carbon is fixed in the biosphere.
- DRapid deforestation and massive burning of fossil fuel, for energy and transport have significantly increased the rate of release of carbon dioxide into the atmosphere.
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