Choose the correct option regarding the diversity of prokaryotes.

  • A
    The number of prokaryotic species is not known with certainty.
  • B
    Conventional taxonomic methods are not suitable for identifying microbial species,and many species cannot be cultured in the laboratory.
  • C
    If biochemical or molecular criteria are used for defining prokaryotic species,their diversity alone might run into millions.
  • D
    All of the above.

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