$X-$ Atmospheric input of phosphorus through rainfall is much smaller than carbon input.
$Y-$ The exchange of phosphorus between organisms and the environment is negligible.

  • A
    Both $X$ and $Y$ are true.
  • B
    Both $X$ and $Y$ are false.
  • C
    $X$ is true but $Y$ is false.
  • D
    $X$ is false but $Y$ is true.

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