Which of the following contribute to the carbon cycle?

  • A
    Photosynthesis
  • B
    Respiration
  • C
    Fossil fuel combustion
  • D
    All of the above

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Complete the following model of the carbon cycle by filling in $A, B, C, D, E,$ and $F$.

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$II.$ Weathering of sedimentary rocks makes phosphate available to the soil.
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