Micro Organisms
Genetic and biochemical similarities between contemporary cyanobacteria and eukaryotic chloroplasts are accepted to mean that

eukaryotes evolved from archaea
eukaryotes evolved from bacteria
cyanobacteria arose from chloroplasts which escaped from plant cells
oxygenic photosynthesis first evolved in eukaryotes

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Micro Organisms
Eukaryotic cell organelles first emerged

just before the origin of the animal and fungal kingdoms
when prokaryotes engulfed each other and became interdependent
when bacteria made their first attempts at reproduction
from a specialized lineage of cells within the kingdom Protista

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