Bacteria as Part of Microorganisma

Microorganisma is a large group that is included bacteria, viruses, spores and others micro creature. A large group of prokaryotic microorganism characterized by multiplying via fission or forming spores, and generally lacking chlorophyll or distinct nucleus surrounded by a membrane. Bacteria furnish both the raw material and the chemical machinery for their own reproduction, whereas viruses, for example do not. 

Bacteria is constitute one of division in the kingdom Monera. Bacteria are unicellular and often classified by shape and may be spherical, spiral, rodlike, or coma shaped. They may be saprophytic (bacteria are the major the composers in most ecosystem), parasitic (such as those causing diseases such as pneumonia or typhoid fever), or auto-trophic (hydrogen sulfide bacteria).
The oldest sign of life is a fossilized bacteria cell discovered in a rock in Africa and estimated at about 3.5 billion years old. 

The study of bacteria is called bacteriology, which belongs to the broader science of MICROBIOLOGY, or the study of all types of microorganism , including one-celled protozoan, yeast, and algae.
Medical microbiology is concerned with the behavior and control of pathogens, which are microorganisms that cause infectious DISEASES in human and other animals.

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