What is the approximate amount of carbon fixed in the biosphere annually through photosynthesis?

  • A
    $2 \times 10^{13} \, kg$
  • B
    $4 \times 10^{16} \, kg$
  • C
    $4 \times 10^{13} \, kg$
  • D
    $2 \times 10^{16} \, kg$

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