The idea that life was brought to earth is not a satisfying solution. It just kicks the bucket down to asking where that life came from.
If I knew the answer to your question, I would be quite famous, it is one of a few really difficult problems in science. The first life just has to be an accurately self replicating molecule, such as RNA. It more than likely happened in the bottom of the sea by volcanic areas, allowing high temperature and lots of elements to gather.
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