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Stromatolites from Bolivia, from the Proterozoic (2.3 billion years ago). Vertical polished section.
Stromatolites growing in Yalgorup National Park in Australia

The origin of life on Earth is a scientific problem which is not yet solved. There are many ideas, but few clear facts.

Most experts agree that all life today evolved by common descent from a single primitive lifeform. It is not known how this early life form evolved, but scientists think it was a natural process which happened about 3,900 million years ago. This is in accord with the philosophy of naturalism: only natural causes are admitted.

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