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Single cell organisms date back to approximately 3.5-3.8 billion years old. These are bacteria and archaea.

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13y ago
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11y ago

It should be bacteria.

The 34000-year-old bacteria that's still alive

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12y ago

The kingdom Archaebacteria were the first bacteria on Earth. Cyanobacteria appeared about 3.5 billion years ago, and modern species of bacteria are at least many millions of years old.

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12y ago

Shark is one.

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6y ago

archaebacteria

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Q: What is earths oldest form of life?
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