Generally,atmospheric $CO_2$ is not a limiting factor for hydrophytes because...

  • A
    Hydrophytes fix $H_2S$ during their photosynthesis.
  • B
    Such plants obtain $CO_2$ from water in the form of $HCO_3^-$.
  • C
    They do not require glucose for their respiration.
  • D
    All of the above.

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