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(D) $1$. Carbon constitutes $49\%$ of the dry weight of organisms,not $39\%$. Thus,option $A$ is incorrect.$2$. Fossil fuels represent a major reservo

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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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(D) $1$. Carbon constitutes $49\%$ of the dry weight of organisms,not $39\%$. Thus,option $A$ is incorrect.$2$. Fossil fuels represent a major reservoir of carbon. Thus,option $B$ is incorrect.$3$. According to estimates,approximately $4 	imes 10^{13} 	ext{ kg}$ of carbon is fixed in the biosphere through photosynthesis annually,not $5 	imes 10^{13} 	ext{ kg}$. Thus,option $C$ is incorrect.$4$. Human activities such as rapid deforestation and the massive burning of fossil fuels for energy and transport have significantly increased the rate of release of carbon dioxide into the atmosphere,leading to global warming. Thus,option $D$ is correct.

Choose the correct sentence regarding the carbon cycle.

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