Follow us  




Bacteria are unicellular organisms, in other words they are made of a single cell. Bacteria were the first organisms that lived on the Earth. They appeared 3 billion years ago in the waters of the first oceans. Bacteria or prokaryotes are the most widespread living beings in the Earth: in a spoonful of soil, for example, it is possible to find up to 10,000 billion bacteria. Their size is extremely small, in fact most bacteria cells have a diameter that ranges from 1 to 10 microns (one micron is equivalent to one thousandth of a millimetre): a line of one thousand neatly arranged bacteria, would be only one millimetre long.


The term pandemic indicates a disease that affects...

Sanitary emergency
The modality study and the death entity...

Read all the Special Reports

More info

Bacteria as miners
The ability of chemoautotrophic bacteria to take energy from...

Bacteria as detergents
Enzymes are proteins produced by the cells of all living organisms...

Read all the Curiosities

Related topics

Another case of symbiosis is the one between the mollusc Tridacna...
Read more

A long food chain
Even if protista are rather small in size...
Read more