Micro Organisms
Carl Woese and his colleague are best known for establishing

the prokaryote-eukaryote system
the five kingdom system
the three domain system
the plant-animal system

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

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