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Trillions, maybe Quadrillions of years ago. (old answer)

On our planet, life begain about 3.8 billion years ago. Heres a timeline

http://en.wikipedia.org/wiki/Timeline_of_evolution . And for the other, Inevitably I'm sure their are way more life forms than just on earth. So I cannot say other than that. :) (ask E.T.)lol

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13y ago

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