Which microorganisms are included in the Kingdom $Monera$?

Cyanobacteria and heterotrophic bacteria have been clubbed together in eubacteria of kingdom-Monera as per the "five kingdom classification", even though the two are vastly different from each other. Is this grouping of the two types of taxa in the same kingdom justified? If so, why? Discuss the cellular composition of cyanobacteria and heterotrophic bacteria that make them classified as eubacteria.

Which of the following are symbiotic prokaryotic organisms that fix atmospheric nitrogen?

The Kingdom $Monera$ includes ...........

Barophilic prokaryotes are ..........

State the characteristic features of Kingdom Monera.