Answer:
The correct order of origin of eukaryotic cells would be:
Origin of organic compounds from inorganic precursors. For example, the formation of carbohydrates, amino acids et cetera from simpler compounds such as water, hydrogen, methane et cetera.
↓
Origin of prokaryotic cells such as photosynthetic cyanobacteria.
↓
Origin and increase in the amount of oxygen in the atmosphere.
↓
Endosymbiosis of prokaryotic cells took place.
↓
origin of eukaryotic cells took place.
