The evolution of life is the most likely cause of the change in the earth's atmosphere from co2-rich to co2-poor.
The evolution of life forms we know of were microscopic organisms (microbes) that left their presence signals in rocks about 3.7 billion years ago. The signal consisted of a type of carbon molecule produced by living organisms.
evolution of life began at least 3.5 to 4 billion years ago and has been evolving ever since. In the beginning, all life on Earth was a simple single-celled organism. Much later, the first multicellular organisms developed, after which the Earth's biodiversity increased sharply.
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