Question

which is the first living thing on earth and how oxygen came to earth ​

Answer 1

Answer:

An Oxygen Atmosphere

When cyanobacteria evolved at least 2.4 billion years ago, they set the stage for a remarkable transformation. They became Earth's first photo-synthesizers, making food using water and the Sun's energy, and releasing oxygen as a result.

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Answer 2

Answer:

An Oxygen Atmosphere

When cyanobacteria evolved at least 2.4 billion years ago, they set the stage for a remarkable transformation. They became Earth's first photo-synthesizers, making food using water and the Sun's energy, and releasing oxygen as a result

Explanation:

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