Bacteria

Bacteria is a kind of microscopic organisms.These are known in the biosphere as the simplest and smallest organisms. In 1675, the Olandaz scientist Antony von Leeuwenhoek first observed the presence of the bacteria in a blistered water under his discovered microscope. He named them small animals.

Bacteria are the unicellular microbiological organisms, complex cell walls, and the single genuine microscopic organisms of the nucleus of primitive nature.

Bacteria are tiny living beings they are neither plants nor animals - they belong to a group all by themselves. Bacteria are tiny single-cell microorganisms, usually a few micrometers in length that normally exist together in millions. 

A gram of soil typically contains about 40 million bacterial cells. A milliliter of fresh water usually holds about one million bacterial cells.

Bacteria come in three main shapes:

1) Spherical (like a ball)                    2) Rod shaped                          3) Spiral

Bacteria are found everywhere:

 Soil, radioactive waste, water, plants, animals, deep in the earth's crust, organic material, Arctic ice, glaciers, hot spring, the stratosphere, ocean depths - they have been found deep in ocean canyons and trenches over 32,800 feet (10,000 meters) deep. They live in total darkness by thermal vents under incredible pressure. They make their own food by oxidizing sulfur that oozes from deep inside the earth.