Micro Organisms
The idea of selective toxicity was first proposed by

Alexander Fleming
Paul Ehrlich
Louis Pasteur
Antony van Leeuwenhoek

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

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

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