List the main stages of primary evolution according to the Oparin-Haldane theory, starting with the formation of the primary broth and ending with the appearance of autotrophs.
1. The primary broth contained organic matter.
2. In the primary broth, coacervate droplets formed, consisting of nucleic acids and proteins surrounded by lipid membranes. They gave rise to heterotrophic prokaryotes.
3. As the primary broth was depleted, part of the prokaryotes became autotrophs.
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