Bacteria: Definition, Size,Distribution and Classification

Distribution of Bacteria
Bacteria are found in all-natural ecosystems and have a worldwide distribution. Their distribution is because they can withstand great extremes of temperature, moisture, acidity, and salinity and are adapted to a wide variety of energy sources. They occur in the atmosphere to a height of about six kilometers and on the seafloor five kilometers below the mean sea level. they exist in hot springs and can also survive below freezing points in the Atlantic ice. Bacteria live at the pressure of one atmosphere but they can tolerate the pressure of 3000-6000 atmospheres. some bacteria can live in presence of oxygen while some live without oxygen. the great success of bacteria is due to their small size, rapid reproductive rate, ability to survive under adverse conditions, and metabolic adaptations.

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