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3,500 Million Years Ago

This is a significant step in the right direction of the planet's history, as it is where the first organisms come to life. They are in the form of single-celled organism.

They could have been bacteria, or archaea, we're not entirely sure, but we know they were alive. No-one can explain why it happened either, it just seemed to be the right conditions for something to happen.

A bacteria cell we know about today.

We know what a modern-day bacteria cell looks like, but these organisms were very simple, and perhaps not as advanced as the one in the picture above.

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