When $cocci$ bacteria are present in a bunch or cluster,they are called:

Some microorganisms grow and multiply at temperatures of $100-105^{\circ}C$. They are included in:

Organisms,which obtain energy by the oxidation of reduced inorganic compounds,are called:

The cells of the bacterium $Streptococcus$ remain arranged in the form of

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

$S$: Thermoacidophiles survive in acidic and high-temperature conditions.
$R$: Archaea can survive in extreme conditions.