Where do we find bacteria?

Hint: Kingdom monera includes the most ancient, the smallest, the simplest and the most abundant microorganisms. These organisms are most primitive, they were the first inhabitants of the earth, and they still continue to flourish. Bacteria are members of this kingdom.

Complete answer:
Bacteria are found almost everywhere on Earth be it hot springs, deserts, snow or deep oceans. Many of them live in or on other organisms as a parasite.
Habitats of different groups of bacteria:
1. Archaebacteria: they live in most habitats such as when they live in extreme salty conditions called halophiles, those who live in hot springs called thermoacidophiles and those which live in marshy areas are called methanogens.
2. Eubacteria: These are also called true bacteria. It includes several subgroups like cyanobacteria, mycoplasma, actinomycetes, rickettsiae, chlamydia etc. Cyanobacteria are found in mainly fresh water but few are in marine as well e.g. red sea is named so because of abundant occurrence of a cyanobacterium Trichodesmium erythromycin, which impart red colour to water. Mycoplasma is generally found in soil, sewage water, plants and animals. Mycoplasma infects animals eg dog, sheep, mice and man and also plants as well such as potato, corn etc.

So we can say that Bacteria is cosmopolitan that means it can be found anywhere.

Note:
Monerans are unicellular, colonial or filaments, prokaryotic organisms without nuclear membrane, nucleolus, chromatin and histone proteins. Nucleoid or incipient nucleus is composed of naked DNA, RNA and non histone proteins. DNA is circular and double stranded. Cell wall is made up of peptidoglycans (amino acids+sugar) except in archaebacteria and Mycoplasma.