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There's a lot more than three - but :

Pansporia ... it started elsewhere and migrated here (on meteorites - maybe from Mars).

Protein first. Bags (bubbles) of proteins learned to reproduce (self replicating - like prions).

DNA (or really RNA) first ... perhaps augmented by reactions on the surface of clay.

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Q: What are three scientific hypotheses about how and where life began on earth?
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