Which of the following statements is correct?

  • A
    Mycoplasma is the smallest and wall-less living organism.
  • B
    Influenza and herpes are caused by viruses having both $DNA$ and $RNA$.
  • C
    Nostoc and Anabaena are important decomposers.
  • D
    Methanogens are methane-producing bacteria found in wheat crops.

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$A$: Blue-green algae are prokaryotic algae.
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