Question

which was the first bacteria on Earth​

Answer 1

Answer:

At first, there were only anaerobic heterotrophic bacteria (the primordial atmosphere was virtually oxygen-free). The first autotrophic bacteria, very similar to the current cyanobacteria, appeared approximately 2 billion years ago.

Answer 2

Answer:

Scientists initially believed that cyanobacteria were present on earth as early as 2.7 billion years ago.

Explanation:

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