Theory:

Monera:
  • These are organisms that lack a well-defined nucleus and cell organelles. Hence they are categorized as prokaryotes (Their cells lack a nuclear membrane).
  • Though these organisms lack multicellular body designs, they show a wide range of diversity based on many other characteristics.
  • This kingdom comprises both organisms whose cells have a cell wall and lack a cell wall.
  • The presence and absence of cell walls have very different effects on body design in these organisms than multicellular organisms.
  • They comprise both autotrophic and heterotopic organisms. But most of the bacteria a heterotrophic.
Example:
Bacteria, mycoplasma and blue-green algae or cyanobacteria.                                                        
BeFunky-collage (3).jpg
Monera: Top left - Bacteria; Top right - Blue green algae; Bottom -Mycoplasma
Archaea:
The Kingdom Monera is further classified as Archaea that includes the bacteria which can live in harsh conditions. These organisms lack a cell wall.
 
As these organisms can live in extreme temperatures, they are also known as Extremophiles and are further classified based on their habitats.
 
BeFunky-collage (4).jpg
Archea: Top left - Thermophiles; Top right - Methanogen; Bottom - Halophytes
 
Halophiles:
These organisms live in extremely salty water.
  
Thermophiles:
These organisms are found in hot springs and volcanoes.
  
Methanogens:
They are found in the guts of animals like cow and sheep. They are involved in the production of methane gas.
Reference:
https://www.flickr.com/photos/basf/7629005292
https://upload.wikimedia.org/wikipedia/commons/b/b6/Haloferax_volcanii.png
https://upload.wikimedia.org/wikipedia/commons/thumb/5/5c/Thermococcus_gammatolerans.jpg/512px-Thermococcus_gammatolerans.jpg
https://www.flickr.com/photos/92803392@N02/9257299518