Which of the following are concerned with eubacteria?
$(1)$ Methanogens $(2)$ Anabaena $(3)$ $N_2$ fixation $(4)$ Thermoacidophiles $(5)$ Eukaryotes $(6)$ Diatoms $(7)$ Gelatinous sheath $(8)$ Heterocyst

  • A
    $1, 4, 7$
  • B
    $2, 3, 7, 8$
  • C
    $4, 5, 6, 7$
  • D
    $1, 3, 6, 7$

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