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The prokaryotes are small unicellular creatures found on Earth.Bacteria and Archaea are two different forms of prokaryotes.Prokaryotes specifically do not possess a nucleus or any other organelles in their structure.

Prokaryotes existed on the Earth about 4.2 billion years ago. They were the first living organisms to be found on the Earth.Since then, they have played an important role in balancing the ecology of the organisms on Earth.

Initially, they survived on the carbon compounds found in the ocean beds of the Earth. Further, they started using the energy obtained from the Sun and other elements like sulfide to produce their energy for survival.Until 3.7 billion years ago, prokaryotes were the only living organisms present on the planet.

Prokaryotes are of much importance on the planet, as they play a key role in many metabolic processes occurring in the environment.They recycle the nutrients from the dead and decomposed organisms.

Due to all these reasons, microscopic organisms are of great importance to all the life forms on the planet. Biogeochemical cycles are regulated by the prokaryotes, such as the carbon and nitrogen cycle.