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Fossil evidence shows that prokaryotic cells have been living for about 3.5 billion years on Earth. This is based on the oldest known fossilized prokaryotic cells found in ancient rocks. These cells are believed to be some of the earliest forms of life on our planet.
Therefore, the correct answer to your question is:
- 3.5 billion years
This timeframe signifies the ancient origins of prokaryotic cells on Earth as supported by fossil evidence. If you have any more questions or need further clarification, feel free to ask!
