Micro Organisms
The three domain version of life on earth is based on the

metabolic traits
morphological traits
characteristics of the cell wall
nucleic acid sequence data

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Micro Organisms
Eukaryotic cell organelles first emerged

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

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

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

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