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There are many theories to this, but i will give you the two most common ones, 1. There was some sort of interaction between the earth and the sun that caused one celled organisms to arise 2. That one-celled organisms formed in oxygen bubbles inside ice, and when the ice thawed they were able to flourish. if you are asking this for school or any reason that will have an impact on your life, double check because i could always be wrong

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16y ago

What else can I help you with?