Before you can have life, you have to have bacteria which is the smallest living unicellular organism. Of bacteria, the simplest is the mycoplasma cell which is 10% the size of E.coli. Before bacteria, the cell had to be born. Fritjof Capra explains it as molecular self-organization. Imagine a primordial sea intermingled and filled with micelles (lipids). You can imagine this as oil on the sea that gets tossed with the waves and begins to form sea foam or the bubbles forming around an undersea hydrothermal vent. These bubbles are collection of lipids that align in a specific way to form spheres (vesicles) due to their alignment between hydrophilic heads and hydrophobic tails. This is believed to have formed microbial mats or biofilms that brought about the beginning of the first cells (prokaryotes). Prokaryotes are single cell organisms that lack a nucleus.

• Micelles > Lipids > Vesicles > Cells – Prokaryotes & Eukaryotes – Bacteria > S.E.T > …
• Lynn Margulis’ Serial Endosymbiosis Theory, explains how bacteria laden cells merged and evolved to eventually create life. Bacteria attempting to feed merged internally with and without viruses and exchanges genes with them. Some of these became complex eukaryotic cells which contain a nucleus.
• From Prokaryotes emerges a variety of bacteria. Archaeobacterium (sulfur & heat loving) (Thermotogota?) merges with a ‘swimming bacterium’ allowing it to move and becomes the nucleocytoplasm (anti-oxygen protist). An oxygen breathing bacterium merges with the nucleocytoplasm allowing it to process oxygen. At this point the nucleocytoplasm was capable of consuming others and attempts to eat photosynthetic bacteria but fails to digest it. It instead merges and the nucleocytoplasm becomes chloroplasts and cyanobacteria (algae) is born.
• S.E.T > Archaeobacterium (Thermotogota?) > Nucleocytoplasm > Chloroplasts > Cyanobacteria (Algae)
• See Also:
  • Symbiotic Theory
• References:
  • Capra Course 
  https://www.capracourse.net/
  •  ‘Symbiotic Planet’ by Lynn Margulis