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ANSWER:Cyanobacteria. It is one of the earliest forms of life on Earth, and likely the FIRST form of life on Earth. EXPLANATION:Evidence (Fossilized Stromatolites) of the Cyanobacteria (the oxygen-producing bacteria) has been found as far back as 3.5 billion years ago. The Cyanobacteria is thought to have played a pivotal role in forming Earth's Atmosphere, because of its oxygenic photosynthesis (photosynthesis with a byproduct of Oxygen).

Cyanobacteria is found in almost EVERY ENVIRONMENT: from Oceans (Salt Water), to Lakes and other fresh water, to bare rock and soil. This is further evidence that it has evolved longer than any other organisms, because of its (most-likely, evolved) survivability in such a variability of environments.

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